An apple farm claims that the average weight of all their apples is 8oz. a sample of 20 apples were picked that had a mean of 7.77oz and standard deviation of 0.95oz. we want to test whether the mean apple weight is different from 8oz. assume that the apple weights are normally distributed.

The mean apple weight is different from 8oz

Step-by-step explanation:

Claim : An apple farm claims that the average weight of all their apples is 8oz.

n = 20

Standard deviation =s = 0.95

Since n < 30

So we will use t-test

x = 7.77

Substitute the values :

Since we are not given the significance level

So, we will take 5%

So,α = 0.05

Degree of freedom = df = n-1 = 20-1 = 19

So, using t table

Since t critical > t statistic

So, we accept the null hypothesis.

So, The mean apple weight is different from 8oz

walter needs to make at least 5 more cookies but no more than 40. 5 ≤ x ≤ 40

step-by-step explanation:

20 ≤ x + 15 ≤ 55

subtract 15 from all parts

20-15 ≤ x + 15-15 ≤ 55-15

5 ≤ x ≤ 40

this means how many more cookies he has to make

walter needs to make at least 5 more cookies, but no more than 40 cookies; 5 ≤ x ≤ 40