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## Homework Statement

If X is distributed normally with mean = 7 and the variance of X is 4 , calculate a 95% interval for mean of X . size interval is 10

## Homework Equations

## The Attempt at a Solution

here's my working :

( 4- 1.960 x (surd(4/10)) ,

**4+1.960 x (surd(4/10)) )**

my ans is incorrect . the correct ans is (6.24, 7.59)

formula which i used

my ans is incorrect . the correct ans is (6.24, 7.59)

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