# Calculating the Mean or Expected Value of the Difference of Two Random Variables

• 1.

Noah earns an average of $40 in a day with a deviation of 2. He spends an average of$13 with a deviation of 5. Calculate the mean value of the difference between the given random variables.

• $27 •$3

• $15 •$37

• 2.

The mean of the burgers baked in Henry's bakery in a day is 180 with a deviation of 3. The mean of the burgers sold by them in a day is 150 with a deviation of 3. What is the expected value of the difference between the given variables?

• 90

• 30

• 3

• 0

• 3.

The mean of the patients getting admitted to a hospital in a day is 6 with a deviation of 0.5. The mean of the patients getting discharged in a day is 6 with a deviation of 0.7. Select the correct mean value of the difference between the above variables.

• 0

• 0.12

• 12

• 6

• 4.

The mean of the individuals visiting a church on Fridays is 80 per hour with a standard deviation of 22. The mean of the individuals visiting the church on Sundays is 71 per hour with a standard deviation of 18. Which of the given options represents the mean value of the difference between random variables?

• 4

• 9

• 40

• 151

• 5.

The mean of the individuals going abroad in a day is 2,500 with a standard deviation of 6. The mean of the individuals returning from abroad in a day is 2,300 with a standard deviation of 5. Identify the correct expected value of the difference between these variables.

• 200

• 2,300

• 2,500

• 4,800

• 6.

The mean of the students enrolling for an IQ test is 480 with a deviation of 12. The mean of the students appearing for the test is 400 with a deviation of 15. Evaluate the mean value of the difference between the given random variables.

• 400

• 80

• 880

• 480

• 7.

The mean of the bulbs manufactured by a company in an hour is 290 with a standard deviation of 56. The mean of the bulbs detected defective in an hour is 10 with a standard deviation of 2. What is the expected value of the difference between the given variables?

• 112

• 300

• 280

• 54

• 8.

The mean of the food imported by an area is 800 metric tons with a deviation of 98. The mean of the food exported by an area is 500 metric tons with a deviation of 102. Choose the correct mean value of the difference between the above variables.

• 200 metric tons

• 300 metric tons

• 1200 metric tons

• 1300 metric tons

• 9.

The mean of the earning made by Diana in a month is $1,500 with a standard deviation of 11. The mean of the money donated by her in a month is$300 with a standard deviation of 9. Which of the given choices represents the mean value of the difference between random variables?

• $1,800 •$1,200

• $1,500 •$300

• 10.

The mean of the cars bought by a firm in a month is 87 with a deviation of 2. The mean of the cars sold by the same firm in a month is 57 with a deviation of 5. Find the correct expected value of the difference between these variables.

• 30

• 37

• 57

• 50

• 11.

The mean of the new students getting admissions to a university in a year is 1,900 with a deviation of 60. The mean of the students passing and leaving the university is 1,500 with a deviation of 55. Calculate the mean value of the difference between the given random variables.

• 400

• 40

• 500

• 50

• 12.

The mean of the cakes baked by a bakery in a month is 700 with a deviation of 51. The mean of the cakes sold by the bakery online in a month is 250 with a deviation of 11. What is the expected value of the difference between the given variables?

• 850

• 950

• 450

• 550

• 13.

The mean and the standard deviation of the insurances made by a company in a month are 480 and 10. The mean and the standard deviation of the insurances claimed by the customers in a month are 120 and 12. Select the correct mean value of the difference between the above variables.

• 260

• 120

• 360

• 480

• 14.

The mean of the individuals entering a hotel in a day is 85 with a deviation of 5. The mean of the individuals checking out from the hotel in a day is 50 with a deviation of 6. Which of the following options matches the mean value of the difference between random variables?

• 85

• 55

• 35

• 25

• 15.

The mean and the standard deviation of the individuals in an area getting spectacles for weak eyesight is 15 and 1 in a day. The mean and the standard deviation of the individuals in an area getting laser done for removing spectacles is 10 and 0.8 in a day. Determine the correct expected value of the difference between these variables.

• 15

• 25

• 5

• 10

• 16.

The mean of the profits made by a company in a year is 20 million dollars with a standard deviation of 0.75. The mean of the spending done by the same company in a year is 5 million dollars with a standard deviation of 0.95. Evaluate the mean value of the difference between the given random variables.

• 25 million dollars

• 5 million dollars

• 15 million dollars

• 20 million dollars

• 17.

The average number of chocolates Susan bought in a day is 8 with a deviation of 1. The average number of chocolates she ate in a day is 4 with a deviation of 2. What is the expected value of the difference between the given variables?

• 2

• 8

• 4

• 10

• 18.

The average number of sweaters made by Mary's grandmother in a month is 60 with a deviation of 2. The average number of sweaters sold online by Mary in a month is 50 with a deviation of 5. Choose the correct mean value of the difference between the above variables.

• 5

• 10

• 50

• 60

• 19.

The mean of the customers entering a restaurant in an hour is 15 with a deviation of 0.2. The mean of the customers leaving the restaurant in an hour is 11 with a deviation of 0.6. Which of the following choices matches the mean value of the difference between random variables?

• 0.6

• 0.2

• 0.4

• 4

• 20.

The mean and the standard deviation of the dogs visiting a veterinary in a day is 18 and 1. The mean and the standard deviation of the cats visiting a veterinary in a day is 21 and 1.3. Find the correct expected value of the difference between these variables.

• 3

• 2.3

• 1.3

• 21

• 21.

The mean of the pocket money given to John in a month is $125 with a standard deviation of 5. The mean of the money spent by him on chocolates in a month is$75 with a standard deviation of 10. Calculate the mean value of the difference between the given random variables.

• $75 •$200

• $125 •$50

• 22.

The mean and the standard deviation of the marks scored by boys in a test is 89 and 2. The mean and the standard deviation of the marks scored by girls in a test is 92 and 5. What is the expected value of the difference between the given variables?

• 5

• 2

• 7

• 3

• 23.

The mean of the children joining a swimming club in a month is 28 with a deviation of 3. The mean of the children leaving the club is 12 with a deviation of 1. Select the correct mean value of the difference between the above variables.

• 18

• 14

• 16

• 12

• 24.

The mean of the garlands made by a flower shop worker in a day is 20 with a standard deviation of 1. The mean of the garlands sold by the flower shop in a day is 19 with a standard deviation of 2. Which of the given options best suits the mean value of the difference between random variables?

• 1

• 2

• 4

• 3

• 25.

The mean of the money invested in a business is $70,000 in a year with a deviation of 500. The mean profit earned in a year is$80,000 with a deviation of 800. Identify the correct expected value of the difference between these variables.

• $80,000 •$10,000

• $70,000 •$1,50,000

• 26.

The mean of the travels booked by a company in a day is 590 with a deviation of 17. The mean of the travels canceled by the customers in a day is 50 with a deviation of 20. Evaluate the mean value of the difference between the given random variables.

• 440

• 40

• 540

• 3

• 27.

The mean number of men applying for a certain job in a company in a year is 180 with a standard deviation of 30. The mean number of women applying for the same job in a company in a year is 200 with a standard deviation of 40. What is the expected value of the difference between the given variables?

• 30

• 40

• 10

• 20

• 28.

The mean of the children entering a park in an hour is 15 with a standard deviation of 0.5. The mean of the children leaving the park is 12 with a deviation of 0.8. Choose the correct mean value of the difference between the above variables.

• 0.8

• 3

• 8

• 0.3

• 29.

The mean of the daily calories consumed by James is 2,000 with a deviation of 70. The mean of the calories burned by him in a day is 1,800 with a deviation of 100. Which of the given choices best suits the mean value of the difference between random variables?

• 1,800

• 800

• 2,000

• 200

• 30.

The mean and the standard deviation of the money made by an organization in a month are $50,000 and 59. The mean and the standard deviation of the money given to the employees in a month are$43,000 and 70. Find the correct expected value of the difference between these variables.

• $43,000 •$50,000
• $7,000 •$17,000