In a random sample of 174 people the mean height was 68 inch

In a random sample of 174 people, the mean height was 68 inches. If the distribution curve is normal and the standard deviation is 2.7 inches.

A) what are the heights at +- 1s?

B) How many people fall between +- 1s?

C) How many people fall above z score of 1?

D) how many people are above a T score of 53?

A) what are the heights at +- 1s?

B) How many people fall between +- 1s?

C) How many people fall above z score of 1?

P(z> 1)= 0.1587, you only need to see z= 1 in the table of standard normal distribution

D) how many people are above a T score of 53?

mean : 68

standard deviation: 2.7

a) P=>53,

x=816 z= (53-68)/(2.7) =-5.5 so the probability P=>-5.5 is = 0.00004

sorry but I do not know the meaning of +- 1S, I hope I will help you if you send me the meaning of that