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The mean and standard deviation of 10 observations are 20 and 2 respectively. Each of these 10 observations is multiplied by p and then reduced by q, (where p≠0 and q≠0). If the new mean and standard deviation becomes half of their original values, then the value of pq is

Answer» The mean and standard deviation of 10 observations are 20 and 2 respectively. Each of these 10 observations is multiplied by p and then reduced by q, (where p0 and q0). If the new mean and standard deviation becomes half of their original values, then the value of pq is


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