Question

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​

Answer 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