QUESTION 11:

"In (2 less than X less than 8), X is a "

continuous random variable discrete random variable no variable constant

QUESTION 12:

Discrete data are made continuous by using

class boundaries class intervals cumulative frequency probability

QUESTION 13:

Find the expectation of a random variable X? if X = 7, 9, 10, 11, 12, and P(X) = 0.2, 0.25, 0.3, 0.15, 0.1 respectively"

11.5 4.5 9.5 14.5

QUESTION 14:

Find the Mean of f(x), where f(x) = 5X+5. The probability distribution of a random variable X ; if X = 12, 14, 15, 16, 17, and P(X) = 0.2, 0.25, 0.3, 0.15, 0.1 respectively"

11 37.5 42 77.5

QUESTION 15:

A small voting district has 110 female voters and 90 male voters. Arandom sampleof 10 voters is drawn. What is the probability exactly 7 of the voters will be female?

0.75 0.51 0.224 0.1665