SUMMATIVE EXAM IN STATISTICS AND PROBABILITY (AUTO 101)

NAME: LAST NAME, FIRST NAME, MIDDLE INITIAL

SECTION:

If three coins are tossed, which is NOT a possible value of the random variable for the number of tails.

• a. 1

• b. 2

• c. 3

• d. 4

Which of the following is a discrete random variable?

• a. Length of electrical wires

• b. number of pencils in a box

• c. amount of sugar used in a cup of coffee

• d. voltage of car batteries

Which formula gives the probability distribution shown by the table below;

x 3 4 5

P(x) 1/3 1/4 1/5

• a. P(x) = X

• b. P (x) = 1/x

• c. P(x) = x/3

• d. P(x) = x/5

How many ways can a "double" come out when you roll two dice?

• a. 2

• b. 4

• c. 6

• d. 8

It is a numerical quantity that is assigned to the outcome of an experiment.

• a. random variable

• b. variable

• c. probability

• d. probability distribution

It is the central or average of its corresponding probability mass function.

• a. mean

• b. variance

• c. standard deviation

• d. probability

What is the mean outcome if a pair of die is rolled once?

• a. 1.5

• b. 2.5

• c. 3.5

• d. 4.5

Find the mean probability distribution involving the random variable X that gives the number of heads that appear after tossing four coins once.

• a. 4

• b. 3

• c. 2

• d. 1