Q1 of 71 Page 201

Find the mean of the following frequency distribution:

We know that,


Where, = Mean, xi = values of x and fi = frequency for that x.





⇒ = 7.07


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The mean of 13 numbers is 24. If 3 is added to every number, what will be new mean?

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The mean monthly salary of five employees in a school is `3000. If one of the employees retires, then the mean monthly salary of the remaining employees becomes `3200. What was the monthly salary of the employee who retired at the time of the retirement?

 2

Find the mean of the following frequency distribution:

 3

Find the mean of the following frequency distribution: