Question

81. For a group of 60 boy students, the mean
and SD of Statistics. marks are 45 and 2
a)
respectively. The same figures for a group of
40 girl students are 55 and 3 respectively.
What is the mean and SD of marks if the two
groups are pooled together?
a) 49 & 5.48
b) 50 & 6
c) 58 & 5.48
d) None
(€)​

Answer 1

Answer:

your solution is in above pics

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