If two samples of sizes 30 and 20 have means as 55 and 60 and variance – McqOptions

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1.	If two samples of sizes 30 and 20 have means as 55 and 60 and variances as 16 and 25 respectively, then what would be the S.D. of the combined sample of size 50?
A.	5
B.	5.06
C.	5.23
D.	None of these
Answer» E.

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