The mean
of first 5 observations is 20 and the
of
last s observations is 45. What is mean
all 10 obsenvations ?
mean
of 양
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1
Answer:
mean=32.5
sum of first 5=20*5=100
sum of last 5=45*5=225
sum of all 10 observation=225+100=325
mean=325÷10=32.5
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