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Question (21)

QN0030738

A cricketer scored 45, 52, 38, 60 and 55 runs in five matches. What is the mean score?

(A) 48
(B) 49
(C) 50
(D) 51

Correct Answer: C

Explanation:

Mean = (45 + 52 + 38 + 60 + 55) ÷ 5 = 250 ÷ 5 = 50.

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Question (22)

QN0030739

Which statement about a representative value is correct?

(A) It always equals the largest observation.
(B) It helps describe the data using a single value.
(C) It ignores most of the observations.
(D) It is always a whole number.

Correct Answer: B

Explanation:

A representative value summarizes an entire data set using a single value.

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Question (23)

QN0030740

The mean of 10 numbers is 14. If one more number, 25, is included, the new mean is

(A) 14
(B) 15
(C) 15.5
(D) 16

Correct Answer: B

Explanation:

Original total = 14 × 10 = 140. New total = 165. New mean = 165 ÷ 11 = 15.

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Question (24)

QN0030741

The mean of 9, 12, 15, 18 and 21 is

(A) 14
(B) 15
(C) 16
(D) 17

Correct Answer: B

Explanation:

Mean = (9 + 12 + 15 + 18 + 21) ÷ 5 = 75 ÷ 5 = 15.

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Question (25)

QN0030742

If the total of eight observations is 200, their mean is

(A) 20
(B) 24
(C) 25
(D) 28

Correct Answer: C

Explanation:

Mean = 200 ÷ 8 = 25.

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Question (26)

QN0030743

The mean of five numbers is 30. If one number is removed, can the new mean be determined?

(A) Yes, it will remain 30.
(B) Yes, it will become smaller.
(C) Yes, it will become larger.
(D) No, more information is needed.

Correct Answer: D

Explanation:

The removed value is unknown, so the new mean cannot be determined.

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Question (27)

QN0030744

A class has 12 students with an average height of 145 cm. What is the total of their heights?

(A) 1620 cm
(B) 1680 cm
(C) 1740 cm
(D) 1800 cm

Correct Answer: C

Explanation:

Total height = 145 × 12 = 1740 cm.

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Question (28)

QN0030745

The mean of 5 consecutive even numbers is 24. What is the smallest number?

(A) 18
(B) 20
(C) 22
(D) 24

Correct Answer: B

Explanation:

The numbers are 20, 22, 24, 26 and 28.

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Question (29)

QN0030746

Which of the following cannot be concluded from knowing only the mean of a data set?

(A) Total of all observations
(B) Number of observations, if total is known
(C) Every individual observation
(D) Average value of the data

Correct Answer: C

Explanation:

Different data sets can have the same mean.

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Question (30)

QN0030747

The average number of books read by 8 students is 6. If all students read the same number of books, each student read

(A) 5 books
(B) 6 books
(C) 7 books
(D) 8 books

Correct Answer: B

Explanation:

If all observations are equal, each observation equals the mean.

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Question (21)

A cricketer scored 45, 52, 38, 60 and 55 runs in five matches. What is the mean score?

Explanation:

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Question (22)

Which statement about a representative value is correct?

Explanation:

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Question (23)

The mean of 10 numbers is 14. If one more number, 25, is included, the new mean is

Explanation:

Link:

Question (24)

The mean of 9, 12, 15, 18 and 21 is

Explanation:

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Question (25)

If the total of eight observations is 200, their mean is

Explanation:

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Question (26)

The mean of five numbers is 30. If one number is removed, can the new mean be determined?

Explanation:

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Question (27)

A class has 12 students with an average height of 145 cm. What is the total of their heights?

Explanation:

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Question (28)

The mean of 5 consecutive even numbers is 24. What is the smallest number?

Explanation:

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Question (29)

Which of the following cannot be concluded from knowing only the mean of a data set?

Explanation:

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Question (30)

The average number of books read by 8 students is 6. If all students read the same number of books, each student read

Explanation:

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