Take this Exam: GED and HiSET mathematics — data and probability | Zestly

Question 1

A jar contains 20 marbles: 5 are yellow, 10 are white, and 5 are black. What is the probability that a randomly selected marble is NOT yellow?

Accepted Answer

3 in 4

Answer

1 in 2

Answer

4 in 5

Answer

1 in 4

Question 2

You have a bag with 4 blue chips and 6 red chips. You draw one chip, put it back, and then draw a second chip. What is the probability of drawing a blue chip both times?

Accepted Answer

4 in 25

Answer

1 in 5

Answer

2 in 5

Answer

4 in 10

Question 3

You have a bag with 4 blue chips and 6 red chips. You draw one chip, keep it out, and then draw a second chip. What is the probability of drawing a blue chip both times?

Accepted Answer

2 in 15

Answer

1 in 5

Answer

4 in 25

Answer

4 in 10

Question 4

In a survey of 400 people, 1 in 5 people said they prefer coffee over tea. Based on this sample, how many people out of 1,000 would you expect to prefer coffee?

Answer

250

Answer

80

Answer

100

Answer

200

Question 5

A website invites its visitors to vote for their favorite color. Of the 50 people who chose to vote, 40 picked blue, and the site reports that 80 percent of people prefer blue. What is wrong with that claim?

Answer

Fifty is far too large a sample to support any statement about a population.

Answer

The 80 percent describes fifty people who chose to vote on one particular website, and there is no reason they stand for everyone.

Answer

Nothing is wrong: a percentage found in any sample applies to the whole population it came from.

Answer

The arithmetic is wrong: 40 out of 50 is not 80 percent.

Question 6

A shop's sales for the first six months of the year, in units, were 120, 135, 150, 148, 162 and 175. What does this record show, and what does it not show?

Answer

Sales rose because the shop began advertising during those months.

Answer

Sales will pass 200 units within the next two months.

Answer

Sales rose over the six months, with one month below the month before it; the record does not say why, and it does not promise the rise continues.

Answer

Sales rose in every single month without exception.