Probability Models

A computer chip company rejects 2% of the chips produced because they fail presale testing. What is the probability that the fifth chip you test is the first bad one you find?

• 0.08

• 0.02

• 0.00

Tags

CCSS.7.SP.C.5

CCSS.7.SP.C.7

A computer chip company manufacturer rejects 2% of the chips produced because they fail presale testing. How many do you expect to test before finding a bad one?

• 2

• 1

• 50

A computer chip manufacturer rejects 2% of the chips produced because they fail presale testing. If you have a random sample of 400 chips, what is the mean number of chips you expect to fail?

• 8

• 80

• 2

About 12% of children are believed to have nearsightedness. A school tests the vision of 169 kindergarten students. How many do you expect to be nearsighted?

• 8

• 12

• 20

An orchard owner knows that he'll have to use about 6% of the apples he harvests for cider because they are bruised or blemishes. He expects a tree to produce about 300 apples. What is the probability that less than 20 apples will be used for cider?

• 74%

• 65%

• 26%

1 out of every 8 frogs has a certain genetic trait. A scientist collects a dozen frogs. What is the probability that at least 2 frogs have the trait?

• 45%

• 82%

• 100%

1 out of 8 frogs has a certain genetic trait. A scientist collects a dozen frogs and wants to know the probability that 3 or 4 will have the trait.

• 18%

• 17%

• 13%

According to the Census Bureau report, 12.7% of Americans live below the poverty level. You plan to sample 25 Americans. What is the probability that at least 2 people will be below the poverty level?

• 84%

• 3%

• 37%

Suppose you flip a coin eight times. What is the probability that you'll get exactly three heads?

• 75%

• 22%

• 50%

2 out of 3 dentists prefer Colgate brand toothpaste. How many dentists would you expect to find that like Colgate toothpaste out of 350 dentist?

• 235

• 117

• 175