Homework Help

It is generally believed that nearsightedness affects about 15% of all children. A local elementary school registered 120 incoming kindergarteners.(For parts b-d, you must use the appropriate command in your calculator and write what you entered. TI-83/84)

a)Find the mean and standard deviation of the sampling distribution and describe the sampling distribution using the notation(, ).

b)What is the probability that less than 10% of the incoming kindergarteners are nearsighted?

c)What is the probability that more than 15% of the incoming kindergarteners are nearsighted?

d)If this school measures at the 80thpercentile for all incoming kindergarten classes, what proportion of incoming kindergarteners are nearsighted?