STATISTICS

Let m be the mid point and b be the upper limit of a class in a continuous frequency distribution. The lower limit of the class is

• 2m - b

• 2m+b

• m-b

• m-2b

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

• 101

• 100

• 99

• 98

A particular observation which occurs maximum number of times in a given data is called its

• Frequency

• range

• mode

• Median

For which set of numbers do the mean, median and mode all have the same values?

• 2,2,2,4

• 1,3,3,3,5

• 1,1,2,5,6

• 1,1,2,1,5

The algebraic sum of the deviations of a set of n values from their mean is

• 0

• n-1

• n

• n+1

The mean of a,b,c,d and e is 28 . If the mean of a, c and e is 24 , then mean of b and d is_

• 24

• 36

• 26

• 34

If the mean of five observations x, x+2 , x+4 , x+6 , x+8 , is 11 , then the mean of first three observations is

• 9

• 11

• 13

• 15

The mean of 5, 9, x, 17, and 21 is 13, then find the value of x

• 9

• 13

• 17

• 21

The mean of the square of first 11 natural numbers is

• 26

• 46

• 48

• 52

The mean of a set of numbers is X . If each number is multiplied by z, the mean is

• x̄ + z

• x̄ - z

• z.x̄

• x̄