Answer:
aa is the repuestos yes ok
I would say A is the only logical answer
Assuming a standard normal distribution, the positive value of interest will be that corresponding to the 50 + 36/2 = 68th percentile. A suitable probability calculator will give that value as 0.46770.
The values that are within ±0.46770 standard deviations from the mean will have a probability of 0.36.
Are you being asked to solve for A? B?
Solve for A:
Take a plus of minus square root
A=
A=
Solve B:
Take plus or minus square roots