How do I find the standard deviation for this problem?

Question

I need help with this homework problem. Thank you in advance!!

A sample of 100 clients of an exercise facility was selected. Let X = the number of days per week that a randomly selected client uses the exercise facility.

X Frequency
0	2
1	13
2	31
3	29
4	11
5	7
6	7

Find the number that is 1.5 standard deviations BELOW the mean. (Round the answer to three decimal places)

Answer 1

Gracie

If you have a TI-84

STAT 1

In L1 enter x values

In L2 enter frequencies

STAT CALC 1

Make sure L1 and L2 are entered

Calculate

Mean 2.83

Sample standard deviation 1.422