Porisma

A hint to get started

Practise inverse-normal cutoffs

For X∼N(60,52)X\sim N(60,5^2), find

(i) mm given P(X<m)=0.2324P(X<m)=0.2324 and

(ii) nn given P(X>n)=0.837P(X>n)=0.837.

CJC · Lecture · Self-Practice 2

Identify the mean and take the square root of the variance.

Convert the event to an interval and sketch the shaded area.

Use normalcdf with lower bound, upper bound, mean and standard deviation in that order.

Read the worked solution