Can anyone please explain this
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See, he is confident that the mean will lie between 7.5 and 21.5
So the mean will be i.e x bar
=7.5+21.5/2
=14.5
Now,
Confidence interval= x bar+z*standard error.
21.5=14.5+1.96*SE.
Solve it you will get 3.57
I hope this helps you!