Asample poll of 100 voters chosen at random from all voters in a given district indicated that 55 of them were in favor of a particular candidate. find the 99% confidence limits for the proportion of all voters in favor of this candidate.

The confidence interval for proportion is

Here

Using standard normal tables .

The 99% confidence interval for proportion is

The CI interpretation is that "We are 99% confident that the proportion of voters in favor of the candidate lies between 0.422 and 0.678".

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