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Q. 1Class mark of class interval 176 – 180 is

A.176

B.180

C.177

D.178

Q. 2For an observation x_{i}, if u_{i}(step deviation from assumed mean) = 3 and a(assumed mean) = 25 and h = 10 then x_{i} =

A.30

B.75

C.55

D.60

Q. 3If assumed mean is 47.5 then find the for the following data, where d_{i} is the deviation of x_{i} from assumed mean.

A.435

B.645

C.540

D.1185

Q. 4The mean of the following frequency distribution is

A.20

B.18

C.16

D.17

Q. 5A survey was conducted by a group of students as a part of their environment awareness programme, in which they collected the following data regarding the number of plants in 20 houses in a locality. Find the mean number of plants per house.

A.8

B.8.1

C.9

D.10.1