The mean of two groups of sizes 200 and 300 are 25 and 10 respectively. Their standard deviation.... VIDEO
The mean of two groups of sizes 200 and 300 are 25 and 10 respectively. Their standard deviation are 3
\( \mathrm{P} \)
and 4 respectively. The variance of combined sample of size 500 is equal to
(1) 64
(2) 65.2
(3) 67.2
(4) 64.2
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