The mean is 60 with an SD of 15. What is the probability of selecting at...

Question

Question

The mean is 60 with an SD of 15. What is the probability of selecting at random a score that falls between 55 and 65?

Answer 1

Answer #1

solution:-
given that mean = 60
standard deviation = 15

=>p(55 < x < 65) = p((55-60)/15 < z < (65-60)/15)

= p(-0.33 < z < 0.33

= p(z < 0.33) − p(z < −0.33)
= 0.6293 - 0.3707
= 0.2586

Answer 2

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