STATISTICS - Jamb Mathematics Past Questions and Answers

Question 201:

• JAMB 2000

If U = {x : x is an integer and 1 \(\leq\) x \(\leq\) 20
E₁ = {x : x is a multiple of 3}
E₂ = {x : x is a multiple of 4}
and an integer is picked at random from U, find the probability that it is not in E₂

A. 3/4
B. 3/10
C. 1/4
D. 1/20

Question 202:

• JAMB 2000

The variance of x, 2x, 3x, 4x and 5x is

A. X√2
B. 2x²
C. X²
D. 3x

Question 203:

• JAMB 2000

Find the sum of the range and the mode of the set of numbers 10, 9, 10, 9, 8, 7, 7, 10, 8, 10, 8, 4, 6, 9, 10, 9, 10, 9, 7, 10, 6, 5

A. 16
B. 14
C. 12
D. 10

Question 204:

• JAMB 2000

In how many ways can a delegation of 3 be chosen from among 5 men and 3 women, if at least one man and at least one woman must be included?

A. 15
B. 28
C. 30
D. 45

Question 205:

• JAMB 2001

Given the scores: 4, 7, 8, 11, 13, 8 with corresponding frequencies: 3, 5, 2, 7, 2, 1 respectively. Find the square of the mode.

A. 49
B. 121
C. 25
D. 64