A toy manufacturer wants to know how many new toys children buy each year. Assume a previous study found the variance to be 3.61. He thinks the mean is 7 toys per year. What is the minimum sample size required to ensure that the estimate has an error of at most 0.12 at the 85% level of confidence?

pay attention in your classes and concentrate the best thing you can do to raise your test scores is to pay attention when you're supposed to be learning the material: in class!

take good notes.

do your homework.

use mnemonics and other tricks.

do practice tests.

note: the best i know.

5x+10 is the correct one

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