7b/12=4.2
7b=50.4
b=7.2
hope this helps
12^2+x^2=15^2
144+x^2=225
- 144 -144
=81= 9
X=9
The answer is 6. Because 4x6=32
Answer: 0.4758
Step-by-step explanation:
Given : Mean : 
Standard deviation : 
Also, the new population of pilots has normally distributed .
The formula to calculate the z-score :-

For x=130 lb .

For x=171lb.

The p-value =

Hence, the required probability : 0.4758