# How do I find the mean and standard deviation from a frequency table?

Asked by chelle21689 (6557) March 13th, 2011

Class ............................ Frequency
18–25 .................. 12
26–33 ................. 18
34–41 .................. 2

Observing members: 0 Composing members: 0

Do you have a graphing calculator?

KateTheGreat (13625)

Is this homework?

blueiiznh (16633)

This is a final exam review. REVIEW lol and yes I do have a graphing calculator. I know I’m supposed to enter data into a list but I don’t know the numbers..

chelle21689 (6557)
blueiiznh (16633)

But this problem doesn’t give out the numbers…just ranges.

chelle21689 (6557)

Assume the numbers are at the midpoint of the ranges.

Dr_Lawrence (19560)

@Dr_Lawrence I guess thats the best you can do… but still feels sketchy.

Anyway, if you are doing that, you can covert the table to:

Class…......................... Frequency
21.5…............... 12
29.5….............. 18
37.5…............... 2

If you had 12 people who were 21.5 years old, 18 who were 29.5 years old and 2 who were 37.5 years old, what would you do? (Try from here, see if it helps).

roundsquare (5512)

or