Calculation of population standard deviation

With p= 80, x= 86and corresponds to z= + 2.00, what is the population standard deviation?

If you have a score of x= 65 on an exam, which set of parameters would give you the best grade on the exam?
– u= 60 and o= 5
– u=70 and o= 10
– u= 60 and o= 10
– u= 70 and o= 5

If you have a population of u= 50 what value would make x= 55 a central representative score in the population?

cannot be determined
o= 10
o=1
o= 5

1. yes, standard deviation=(86-80)/2=3

2. We need to calculate the z score for …

The solution gives detailed steps on computing a standard deviation and z scores using standard normal distribution.