Question 356637: Given the following frequency distribution, find the mean, variance, and standard deviation
error frequency
46-48 22
49-51 23
52-54 23
55-57 9
58-60 7
Answer by stanbon(75887)   (Show Source):
You can put this solution on YOUR website! Given the following frequency distribution, find the mean, variance, and standard deviation
error frequency
46-48 22
49-51 23
52-54 23
55-57 9
58-60 7
-----------------
The mark is the representative value of ALL the numbers in the class
Find the "mark" for each of the classes:
mark:::frequency
47:::::22
50:::::23
53:::::23
56:::::9
58:::::7
=================
mean = 51.345...
std = 3.514..
variance = 12.348
============================
Cheers,
Stan H.
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