While computing mean of a grouped data, we assume that the frequencies are
d_{i} is the deviation of x_{i} from assumed mean a.
Construction of a cumulative frequency table is useful in determining the
The correct answer is b
A cumulative frequency table helps to determine the median of the series.
Mean of 100 items is 49. It was discovered that three items which should have been 60, 70, 80 were wrongly read as 40, 20, 50 respectively. The correct mean is
Sum of 100 observations = 100 x 49 = 4900
Correct sum = 4900  [40 + 20 + 50] + [60 + 70 + 80] = 5000
∴ Correct mean = 5000/100 = 50
In the formula, Mode
Choose the correct answer from the given four options : In the formula
for finding the mean of grouped data are deviation from a of
For the following distribution:
The sum of upper limits of the median class and model class is
While computing mean of grouped data, we assume that the frequencies are
Consider the following frequency distribution of the height of 60 students of a class:
The sum of the lower limit of the modal class and upper limit of the median class is
For the following distribution:
the modal class is
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