if mean of 19 scores is 40 ,then if mean of first 10 scores is 39 and last ten scores is 38 then find 10 th score of the data
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Mean of 19 scores = 40
Sum of 19 scores = 40×19 = 760
Mean of first 10 scores = 39
Sum = 10× 39 = 390
Mean of last ten scores = 38
Sum = 38 ×10 = 380
Add both the sum = 390+380 = 770
10th score of data = 770-760 = 10
Hope my answer is right and it helps you.
Sum of 19 scores = 40×19 = 760
Mean of first 10 scores = 39
Sum = 10× 39 = 390
Mean of last ten scores = 38
Sum = 38 ×10 = 380
Add both the sum = 390+380 = 770
10th score of data = 770-760 = 10
Hope my answer is right and it helps you.
mahidhar4:
key gives answer of 20
sorry than i don't know.
maybe your key answer is wrong dear
are you 10 th standard
no, 9th standard
ok sister
why? what happened?
nothing
okay
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