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Question (11)

QN0030728

The mean of 7, 9, 13 and 15 is

(A) 10
(B) 11
(C) 11.5
(D) 12

Correct Answer: B

Explanation:

Mean = (7 + 9 + 13 + 15) ÷ 4 = 44 ÷ 4 = 11.

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Question (12)

QN0030729

If the mean of five numbers is 32, which expression gives their total?

(A) 32 + 5
(B) 32 – 5
(C) 32 × 5
(D) 32 ÷ 5

Correct Answer: C

Explanation:

Total = Mean × Number of observations.

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Question (13)

QN0030730

A shop sold 18, 22, 25, 20 and 15 notebooks on five days. What was the average number of notebooks sold per day?

(A) 18
(B) 19
(C) 20
(D) 21

Correct Answer: C

Explanation:

Mean = (18 + 22 + 25 + 20 + 15) ÷ 5 = 100 ÷ 5 = 20.

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Question (14)

QN0030731

Which representative value is generally used to describe the overall performance of a group?

(A) Mean
(B) Smallest value
(C) Largest value
(D) Difference between values

Correct Answer: A

Explanation:

Mean is commonly used to represent the overall performance of a group.

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Question (15)

QN0030732

The mean of 9 numbers is 18. One more number, 28, is included. The new mean is

(A) 18
(B) 18.5
(C) 19
(D) 20

Correct Answer: C

Explanation:

Original total = 18 × 9 = 162. New total = 190. New mean = 190 ÷ 10 = 19.

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Question (16)

QN0030733

The mean of 25, 30, 35, 40 and 45 is

(A) 33
(B) 34
(C) 35
(D) 36

Correct Answer: C

Explanation:

Mean = (25 + 30 + 35 + 40 + 45) ÷ 5 = 175 ÷ 5 = 35.

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Question (17)

QN0030734

The mean of six numbers is 18. If five of the numbers are 12, 15, 17, 20 and 22, the sixth number is

(A) 20
(B) 21
(C) 22
(D) 23

Correct Answer: C

Explanation:

Total = 18 × 6 = 108. Sum of the five numbers = 86. Sixth number = 108 – 86 = 22.

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Question (18)

QN0030735

Which of the following data sets has a mean of 12?

(A) 10, 11, 12, 13, 14
(B) 8, 10, 12, 14, 16
(C) 9, 10, 11, 12, 13
(D) 5, 10, 15, 20, 25

Correct Answer: A

Explanation:

Sum = 60 and Mean = 60 ÷ 5 = 12.

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Question (19)

QN0030736

The average rainfall over 4 days is 18 mm. What is the total rainfall during these days?

(A) 54 mm
(B) 64 mm
(C) 72 mm
(D) 80 mm

Correct Answer: C

Explanation:

Total rainfall = Mean × Number of days = 18 × 4 = 72 mm.

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Question (20)

QN0030737

The mean of 16, 20, 24 and x is 22. Find x.

(A) 24
(B) 26
(C) 28
(D) 30

Correct Answer: C

Explanation:

Total = 22 × 4 = 88. Sum of known numbers = 60. Therefore, x = 28.

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Question (11)

The mean of 7, 9, 13 and 15 is

Explanation:

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Question (12)

If the mean of five numbers is 32, which expression gives their total?

Explanation:

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Question (13)

A shop sold 18, 22, 25, 20 and 15 notebooks on five days. What was the average number of notebooks sold per day?

Explanation:

Link:

Question (14)

Which representative value is generally used to describe the overall performance of a group?

Explanation:

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Question (15)

The mean of 9 numbers is 18. One more number, 28, is included. The new mean is

Explanation:

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Question (16)

The mean of 25, 30, 35, 40 and 45 is

Explanation:

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Question (17)

The mean of six numbers is 18. If five of the numbers are 12, 15, 17, 20 and 22, the sixth number is

Explanation:

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Question (18)

Which of the following data sets has a mean of 12?

Explanation:

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Question (19)

The average rainfall over 4 days is 18 mm. What is the total rainfall during these days?

Explanation:

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Question (20)

The mean of 16, 20, 24 and x is 22. Find x.

Explanation:

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