# ؟؟

#### osamastat

##### Member
if you know that The arithmetic mean of the heights of a group of people is 172 and standard deviation is 6 What is the percentage of people whose height ranges between 162 and 178?
one supposed it can be solved without using Z table!!

#### Dason

##### Ambassador to the humans
If you assume a normal distribution then look up the empirical rule. If not then search Chebyshevs inequality