Question

the average daily rainfall during first 30 days in August was 292 mm. after the rainfall for 31st August was recorded the average daily rainfall for August became 292.2mm.how much did it rain on 31st August ​

Answer 1

Answer:

Mean = sum/no.of observations

292 = sum/30

sum = 292×30

sum = 8760

Now one more day is added,

Mean = 292.2

Let the rainfall on that day be x

No.of observations = 31

292.2 = (sum + x) / 31

sum + x = 292.2 × 31

8760 + x = 9058.2

x = 9058.2 - 8760

x = 298.2 mm

It rained 298.2 mm on 31st August

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