In a certain Hospital the mean birth rate of a week was 25. if the mean birth rate from Monday to Thursday was 20 and that of Thursday to Sunday was 28, find the number of births on Thursday?
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Step-by-step explanation:
Mean birth rate in a week= 25
No. of days in a week=7
Sum of observations=25×7 =175
Mean birth rare from Monday to Thursday=20
No. of days in a week=7
Sum of observations=20×7 =140
Mean birth rate from Thursday to Sunday=28
No. of days in a week=7
Sum of observations=28×7 =196
(196+140) - 175
= 336 - 175
=161
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