The number of beverage cans produced each hour from a vending machine is normally distributed with a standard deviation of 8.6. For a random sample of 12 hours, the average number of beverage cans produced was 326.0.Find the lower confidence limitof the 99% confidence interval for the population mean number of beverage cans produced per hour.
And another one
A football player tries 60 penalty kicks. For each kick, he has a 25% chance of scoring. Calculate the standard error of the sample proportion of successful penalty kicks, where the sample is the n=60 kicks