Question

To calculate mean of unequal class intervals

Answer 1

Answer:

The method used will be the same as used for continuous grouped data with equal intervals. First of all we will find the class marks of each interval with equal to lower limit + upper limit divided by 2. Then we will multiply the frequencies with their respective class marks.

Answer 2

Explaination :

First of all we will find the class marks of each interval with equal to lower limit + upper limit divided by 2.

class mark = $\frac{upper + lower}{2}$

Then we will multiply the frequencies with their respective class marks. Will will add all these products and divide them by the total frequency. We get the mean.

while finding the mean,if the class sizes are unequal then h can be taken as any number which divides all the mid points. Choice of h does not affect the mean

#Learn more :

How to calculate mode and median for unequal class interval

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