To get the number of members between 15 years and 30 years we proceed as follows: z=(x-μ)/σ where: mean,μ=23 standard deviation, σ=4 years thus P(15<x<31) when x=15 P(x<15) z=(15-23)/4 z=-2 thus P(x<15)=P(z<-2)=0.0228
when x=31 z=(31-23)/4 z=2 thus P(x<31)=P(z<2)=0.9772 Hence: P(15<x<31)=0.9544 hence the number of members between that age was: 0.9544×300 =286.32 people ~285 People Answer: 285 people
