Answer:
The correct option is (d) 21.19%.
Step-by-step explanation:
Let the random variable X denote the heights of Fernando's peers.
The mean and standard deviation of the random variable X are:
μ = 68 inches
σ = 10 inches
It is provided that Fernando is 60 inches tall.
Compute the value of P (X < 60) as follows:
[tex]P(X<60)=P(\frac{X-\mu}{\sigma}<\frac{60-68}{10})[/tex]
         [tex]=P(Z<-0.80)\\=1-P(Z<0.80)\\=1-0.78814\\=0.21186\\\approx 0.2119[/tex]
*Use a z-table.
The percentage is, 0.2119 × 100 = 21.19%.
Thus, the percentage of his peers are  shorter than Fernando is 21.19%.
The correct option is (d).
