5 sum how to solve statistics chapter
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According to ur question,
avg salary of 20 person is Rs 7650
Avg salary of 1 person= 7650/20
That is, Rs 382.5
Avg salary of employees and manager= Rs 7650 + Rs 550
That is, Rs 8200
Avg income of 21 person=8200/21
that is , Rs 390.47
with help of this u will find the correct answer
hope it helps u dear
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