On a standardized test with normal distribution the mean is 85 and the standard deviation is 3. Within which range should approximate 99.7% of the score lie

3. solve the given inequality and graph the solution on a number line.

What is 20+(5 x 2/5 )+ 3 show your work

2people are trying different phones to see which one has the better talk time. chatlong has an average of 18 hours with a standard deviation of 2 hours and talk-a-lot has an average of 20 hours with a standard deviation of 3. the two people who tested their phones both got 20 hours of use on their phones. for the z-scores i got 1 for the chatlong company and 0 for talk-a-lot. what is the percentile for each z-score?