EASY
10th CBSE
IMPORTANT
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In a grouped frequency distribution, the mid-values of the classes are used to measure which of the following central tendency?

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Important Questions on Statistics

EASY
10th CBSE
IMPORTANT
In the formula: x¯=a+fidifi for finding the mean of the grouped data, di's are deviations from a (assumed mean) of
EASY
10th CBSE
IMPORTANT
In the formula: x¯=a+hfiuifi, for finding the mean of grouped frequency distribution, ui=
EASY
10th CBSE
IMPORTANT
While computing mean of grouped data, we assume that the frequencies are
EASY
10th CBSE
IMPORTANT
If xi's are the mid-points of the class intervals of grouped data, fi's are the corresponding frequencies and x¯ is the mean, then fixi-x¯ is equal to
EASY
10th CBSE
IMPORTANT
Construction of a cumulative frequency distribution table is useful in determining the 
EASY
10th CBSE
IMPORTANT

The times, in seconds taken by 150 athletes to run a 110 m hurdle race are tabulated below:

Class 13.8-14 14-14.2 14.2-14.4 14.4-14.6 14.6-14.8 14.8-15
Frequency 2 4 5 71 48 20

The number of athletes who completed the race in less than 14.6 seconds is

MEDIUM
10th CBSE
IMPORTANT

Consider the following frequency distribution:

Class 0-5 6-11 12-17 18-23 24-29
Frequency 13 10 15 8 11

The upper limit of the median class is 

EASY
10th CBSE
IMPORTANT

Daily wages of a factory workers are recorded as:

Daily wages (in ) 131-136 137-142 143-148 149-154 155-160
Number of workers 5 27 20 18 12

The lower limit of the modal class is