Question

in the normal distribution 31% of the item under 45 and 48% are over 64 find the mean and variance of the distribution

Answer 1

With reference to point B, potential energy

of how much water reservoir in the dam will be

converted into kinetic energy?

Answer 2

Answer:

Look up in the Z score table

31% 》》》a

92% (100–8%)》》》b

These values are distances in SD from the mean. So 64 is bSD higher than the mean and 45 is aSD lower than the mean.

So 64-45=19 equals (a+b)SD.

1SD is 19/(a+b)= [s ]

The mean is bSD below 64, so the mean is [mu]