Question

How to compute the mean median and mode for grouped data?

Answer 1

Answer:

Summary

For grouped data, we cannot find the exact Mean, Median and Mode, we can only give estimates.

To estimate the Mean use the midpoints of the class intervals: Estimated Mean = Sum of (Midpoint × Frequency)Sum of Frequency.

To estimate the Median use: Estimated Median = L + (n/2) − BG × w. ...

To estimate the Mode use:

Step-by-step explanation:

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Answer 2

Step-by-step explanation:

Formula & Examples

Formula

1. Mean

ˉ

x

=

∑fx

n

2. Population Variance σ2=

∑f⋅x2-

(∑f⋅x)2

n

n

3. Population Standard deviation σ=

√

∑f⋅x2-

(∑f⋅x)2

n

n

4. Co-efficient of Variation (Population) =

σ

ˉ

x

⋅100%