# Statistics

posted by .

A batch consists of 20 bad apples and 80 good ones. What is the probability of selecting 2 good apples when two are randomly selected if the first selection is replaced before the second is made?

• Statistics -

With replacement, the probability of selecting a good apple stays at 60/80=3/4.
For a two-step experiment, the probability is the product of individual steps, hence, probability of select a good apple in each pick is
(3/4)^2=9/16

## Similar Questions

1. ### Math

Apples are sold in cartons of 25. David bought home 2 cartons an found 3 rotten apples in the first carton. There were thrice as many rotten apples in the second carton. 1. Find the probability of randomly selecting a good apple from …
2. ### PROBABILITY MATH

A batch consists of 12 defective coils and 88 good ones. find the probability of getting two good coils when two coils are randomly selected if the first selection is replaced before the second is made. Help me.. since it would be …
3. ### PROBABILITY MATH

A batch consists of 12 defective coils and 88 good ones. find the probability of getting two good coils when two coils are randomly selected if the first selection is replaced before the second is made. Help me.. since it would be …
4. ### math

A box contains four red, three blue, and six green lenses. Two lenses are randomly selected from the box. Find the probability of getting two red lenses when two are selected if the first selection is NOT replaced before the second …
5. ### Statistics (36)

For borrowers with good credit scores, the mean debt for revolving and installment accounts is \$15,015 (BusinessWeek, March 20, 2006). Assume the standard deviation is \$3,730 and that debt amounts are normally distributed. a. What …

For a batch of apples containing 100 apples the mean mass is 8 gm. For half number of apples selected from 100 apples the mean mass is 10 gm. Find the mean mass of other half number of apples