Given:
The ages of people who attend a local church are normally distributed.
The mean age = μ = 39.5
And the standard deviation = σ = 18
The sketch of the normal curve will be as follows:
As shown the peak of the curve at the mean value = 39.5
and the distance between the consecutive numbers = 18
now, we will find the probability that a person chosen at random from this church is ages 21.5 or younger
So, we will find P( x < 21.5)
As shown, from the graph:
The answer will be = 0.1587
