Probability Review

A grocery store has 8 open checkout lanes. The next 200 customers choose a checkout lane at random. The customers selected Lane 1, Lane 3, or Lane 5 a total of 65 times. What is the relative frequency (experimental probability) of customers selecting Lane 1, Lane 3, or Lane 5?

• 1/25

• 13/40

• 3/8

• 65/200

A safety inspector came into Julia’s store to inspect the fire alarms. Which result of the inspection implies that the next fire alarm inspected has a 7.1% chance of having a defect?

• 5 out of the 56 fire alarms inspected had a defect.

• 2 out of the 56 fire alarms inspected had a defect.

• 7 out of the 56 fire alarms inspected had a defect.

• 4 out of the 56 fire alarms inspected had a defect.

A certain website works properly 99.90% of the time. Which word best describes the chance that the website is working properly when someone tries to use it?

• impossible

• certain

• likely

• unlikely

The probability that Jayson makes his next free throw is 0.72. Which of the following makes Kevin more likely than Jayson to make his next free throw?

• Kevin’s probability is 12%

• Kevin’s probability is 65%

• Kevin’s probability is 85%

• Kevin’s probability is 1.52

A restaurant owner added a new special to the menu. After the first two weeks of the special, he determines that there is a 5/8 chance that a customer orders the special. Which term best describes the probability that a customer orders the special?

• very likely

• likely

• unlikely

• very unlikely

Students in Mrs. Latham’s class collected beach

pictures and labeled them based on the location

in which they were taken.

● 7% were from the Northeastern Atlantic

Ocean

● 23% were from the Southeastern Atlantic

Ocean

● 17% were from the Pacific Ocean

● 53% were from the Gulf of Mexico

One more student brings in a beach picture.

Which location is the most likely location for the

new picture to have been taken?

• Northeastern Atlantic Ocean

• Southeastern Atlantic Ocean

• Pacific Ocean

• Gulf of Mexico

This table shows outcomes of a spinner with

3 equal sections colored orange, blue, and white.

Based on the outcomes, which number is the

best prediction for the number of times the arrow

is expected to land on the orange section if it is

spun 20 times?

• 3

• 6

• 30

• 60

A spinner is divided into 6 equal sections

numbered 1 through 6. Predict how many times,

out of 280 spins, the spinner landed on

an odd number.

• 93

• 70

• 140

• 47

A baseball card collector checked 100 cards in a

case and found that 18 of them were damaged.

What is the experimental probability of the cards

NOT being damaged?

• 0.18

• 9/50

• 82%

• 18%

An owner of a store knows that in the last week

42 customers paid with cash, 154 paid with a

CashApp, and 52 paid with a credit card. Based

on the number of customers from last week,

which fraction is closest to the probability that the

next customer will pay with a credit card?

• 7/8

• 1/3

• 1/4

• 1/5