1. Multiple choice questions I

1. Let $m$ be the midpoint and $b$ be the upper limit of a class in a continuous frequency distribution. The lower limit of the class is 2m + bm - b2m - bm - 2b.

 

2. The mean of a set of seven numbers is $81$. If one of the numbers is discarded, the mean of the remaining numbers is $78$. The value of discarded number is 1019998100.

 

3. The algebraic sum of the deviations of a set of $n$ values from their mean is n + 1n - 10n