Determine whether you can use a normal distribution to approximate the binomial distribution.
if you can, use the normal distribution to approximate the indicated probabilities and sketch their graphs.
if you cannot, explain why and use a binomial distribution to find the indicated probabilities. a survey of u. s. adults found that 64% watch nfl football. you randomly select 20 u. s. adults and ask them whether they watch nfl football.
find the probability that the number who watch nfl football is:

(a) exactly 10
(b) less than 7
(c) at least 15
(d) identify any unusual events.

explain.

Arandom sample of 15 observations is used to estimate the population mean. the sample mean and the standard deviation are calculated as 172 and 63, respectively. assume that the population is normally distributed. a. with 99 confidence, what is the margin of error for the estimation of the population mean? b. construct the 99% confidence interval for the population mean. c. construct the 95% confidence interval for the population mean. d. construct the 83% confidence interval for the population mean. hint: you need to use excel function =t.inv.2t to find the value of t for the interval calculation.