2. The Assignment 1 marks for several groups have come in and the group sizes, means and standard deviations for the groups are below. Group No. 1 2 3 Group Size (n) 1820 Mean (T) 75 89 81 S.D. (0) 4 2 6 Find the standard deviation and mean for the total cohort.
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The marks for several groups have come in and the group sizes, means and standard deviations for the groups are below.
Group No.
1
2
3
Group Size (n)
10
8
12
75
89
81
S.D.
(0)
4
2
6
What's the standard deviation and mean for the total cohort
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