**Q) **Following is the daily expenditure on lunch by 30 employees of a company:

Find the mean daily expenditure of the employees.

**Ans: **We can solve this question by 2 methods: *(you can choose any one method whichever you like):*

**I. Direct Method:**

let’s re-arrange the data with midpoint of each class, frequency, and multiply midpoint with frequency:

Next, mean of grouped data is given by:

Mean of grouped data =

Therefore, Mean expenditure = = 148

**Hence, the mean expenditure of the given data is 148.**

**II. Assumed Mean Method:**

We take center class as a = 150

Next, let’s re-arrange the data with midpoint of each class, frequency, take deviation, and multiply frequency with midpoint:

We know that, mean of grouped data is given by:

Mean of grouped data = a +

Therefore, Mean expenditure = 150 + = 148

**Hence, the mean expenditure of the given data is 148.**

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