were böys and 250 girls. The results were as follows: n1 = 150 X = n2 = 250 X2 = 73 = 72 %3D 01 =7.0 Find the mean and the standard deviation of combined group. 02 = 6.4

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55. A test in mathematics was given to 400 high school children of whom 156
were böys and 250 girls. The results were as follows:
n1 = 150
X1 = 72
n2 = 250
X2 = 73
%3D
01 = 7.0
Find the mean and the standard deviation of combined group.
02 = 6.4
Transcribed Image Text:55. A test in mathematics was given to 400 high school children of whom 156 were böys and 250 girls. The results were as follows: n1 = 150 X1 = 72 n2 = 250 X2 = 73 %3D 01 = 7.0 Find the mean and the standard deviation of combined group. 02 = 6.4
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