4teammates share 5 granola bars equally. how much does each one get?

The mean of a set of data is -3.82 and its standard deviation is 2.31. find the z score for a value of 3.99.

Monitors manufactured by tsi electronics have life spans that have a normal distribution with a standard deviation of 1800 hours and a mean life span of 20,000 hours. if a monitor is selected at random, find the probability that the life span of the monitor will be more than 17,659 hours. round your answer to four decimal places.

I’m really confused and need to learn this