Answer :
Given is the frequency distribution table for ungrouped data.
We have
To find arithmetic mean of school wise savings in each mandal,
A common formula is:
In ‘Amberpet’:
⇒ Mean = Rs 359
In ‘Thriumalgiri’:
⇒ Mean = Rs 413
In ‘Saidabad’:
⇒ Mean = Rs 195
In ‘Khairathabad’:
⇒ Mean = Rs 228
In ‘Secundrabad’:
⇒ Mean = Rs 200
In ‘Bahadurpura’:
⇒ Mean = Rs 837
For arithmetic mean of savings of all the school:
Mean of such ungrouped data is given by
⇒
⇒ Mean = 444
Thus, arithmetic mean of savings of all the schools is Rs 444.
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