Please help ASAP XD
The ages of members of a seniors curling club are normally distributed, with a mean of 63 years and a standard deviation of 4 years. What percent of the curlers is in each of the following age groups?
A) Between 55 and 63 years old
B) Between 67 and 75 years old
C) Older than 75 years

Question

Please help ASAP XD
The ages of members of a seniors curling club are normally distributed, with a mean of 63 years and a standard deviation of 4 years. What percent of the curlers is in each of the following age groups?
	A) Between 55 and 63 years old
	B) Between 67 and 75 years old
	C) Older than 75 years

kirbykirby · Answer

You will need to standardize the values. Like, for a) , say X = age
Then we are finding $P(55 < X <63)$.

By standardizing, we find:$$P\left(\frac{55-63}{4}<\frac{X-63}{4}<\frac{63-63}{4}\right)=P\left(-2<Z<0\right)$$

anonymous · Answer

OKay thanks, i think i know what im doing now XD

kirbykirby · Answer

Ok hehe good then. b) is similar to a). c), you are just finding P(X > 75), and standardize that again