Pls helppp anyone pls

Given:

Mean = 45

Standard deviation = 9

Confidence level = 95%.

To find:

The confidence interval.

Solution:

The formula for confidence interval is:

Where, is mean, z is the z-value at given level of confidence, is the standard deviation and n is the number of observations.

The z-value at 95% confidence level is 1.96.

Here number of observations are not given. Assume it is 1.

Putting .

It can be written as

Approximate the value to the nearest whole number.

The interval for the middle 95% of snowfall is  27 to 63.

Therefore, the correct option is A.