For two groups of observations the following results were available: Group I E(X-5) = 8 E(X- 5)? = 40 N, = 20 Group II E(X-8) =- 10 E(X- 8)²=70 N, = 25 %3D Find the mean and the standard deviation of...

For two groups of observations the following results were available:<br>Group I<br>E(X-5) = 8<br>E(X- 5)? = 40<br>N, = 20<br>Group II<br>E(X-8) =- 10<br>E(X- 8)²=70<br>N, = 25<br>%3D<br>Find the mean and the standard deviation of the 45 observations obtained by combining the two groups.<br>

Extracted text: For two groups of observations the following results were available: Group I E(X-5) = 8 E(X- 5)? = 40 N, = 20 Group II E(X-8) =- 10 E(X- 8)²=70 N, = 25 %3D Find the mean and the standard deviation of the 45 observations obtained by combining the two groups.

Jun 10, 2022

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For two groups of observations the following results were available: Group I E(X-5) = 8 E(X- 5)? = 40 N, = 20 Group II E(X-8) =- 10 E(X- 8)²=70 N, = 25 %3D Find the mean and the standard deviation of...

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