Statistics 10 cbse

If the mean of frequency distribution is 7.5 and summation of fixi =120+3k, summation of fi= 30 then k is

• 40

• 35

• 50

• 45

The mode and mean is given by 7 and 8 respectively. Then the median is

• 1/13

• 13/3

• 23/3

• 33

The mean of the data 4,10,5,9,12 is

• 8

• 10

• 9

• 15

The median of the data 13,15,16,17,19,20 is

• 30/2

• 31/2

• 33/2

• 35/2

If the sum of frequencies is 24 then the value of x in the observation x,5,6,1,2 will be

• 4

• 6

• 8

• 10

The mean of following distribution is

Xi : 11 14 17 20

fi : 3 6 8 7

• 15.6

• 17

• 14.8

• 16.4

CI: 0-10 10-20 20-30 30-40 40-50

f: 20 30 24 40 18

the sum of lower limits of the modal class and median class is

• 20

• 30

• 40

• 50

CI: 0-5 6-11 12-17 18-23 24-29

f: 26 20 30 16 22

The upper limit of the median class is

• 18.5

• 18

• 17.5

• 17

Mode and median of a data are 12k and 15k. Median of the data is

• 12k

• 14k

• 15k

• 16k

Mean of 100 items is 49. It was discovered that three times which should have been 60,70,80 were wrongly read as 40, 20, 50 respectively. The correct mean is

• 48

• 49

• 50

• 60