LLN Probability and Statistics 5

Question 1

You have 3 shirts and 4 pairs of pants. How many different shirt-and-pants outfits can you make?

Accepted Answer

12

Answer

By the counting principle, 3 x 4 = 12 outfits.

Question 2

A box of 20 light bulbs contains 2 defective bulbs. What is the probability that a randomly chosen bulb works?

Accepted Answer

9/10

Answer

18 of the 20 bulbs work, and 18/20 = 9/10.

Question 3

Commute times in minutes were 12, 15, 15, 18, 20, 22, and 25. What is the median?

Accepted Answer

18

Answer

With 7 sorted values, the 4th value, 18, is the middle.

Question 4

Event attendance rose from 200 people to 250 people. What is the percent increase?

Accepted Answer

25%

Answer

The increase of 50 divided by the original 200 is 0.25, or 25%.

Question 5

A coin is tossed 50 times and lands heads 28 times. What is the experimental probability of heads?

Accepted Answer

0.56

Answer

Experimental probability is 28/50 = 0.56.

(LLN) Language Literacy and Numeracy Test Practice Test