Question

The average height of 12 children is 124.7 with a standard deviation of 7.5. Assuming

that the heights are normally distributed, what percent of the students have a height of

132.2 and longer?

Answer 1

$$P(X\ge132.2)=1-P(Z<\dfrac{132.2-124.7}{7.5})$$

$$=1-P(Z<1)\approx0.158655$$

15.8655%