Hi

Can you please advise of the answers for these questions please and how you worked it out as i'm just not getting it. Thanks

1)A normal distribution has a mean of = 100 with = 20. If one score is randomly selected from this distribution, what is the probability that the score will have a value between X = 80 and X = 100?

Group of answer choices

a)0.8413

b)0.1587

c)0.3413

d)0.6826

Q2

A normal distribution has a mean of = 70 with = 12. If one score is randomly selected from this distribution, what is the probability that the score will be less than X = 94?

Group of answer choices

a)0.0456

b)0.0228

c)0.9772

d)0.9544

Q3

f an entire population with = 60 and s = 8 is transformed into z-scores, then the distribution of z-scores will have a mean of ____ and a standard deviation of ____.

Group of answer choices

a)0 and 1

b)60 and 1

c)0 and 8

d)60 and 8 (unchanged)

thanks heaps

Daniell