The mean and standard deviation of 20 observations \( \mathrm{P} \)...

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The mean and standard deviation of 20 observations
\( \mathrm{P} \) were calculated as 10 and 2.5 respectively. It was found

W that by mistake one data value was taken as 25 instead of 35 . If \( \alpha \) and \( \sqrt{\beta} \) are the mean and standard deviation respectively for correct data, then \( (\alpha, \beta) \) is:
(1) \( (11,26) \)
(2) \( (10.5,25) \)
(3) \( (11,25) \)
(4) \( (10.5,26) \)
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