Question

jake is a math student who answers multiple choice questions correctly 75% of the time. what is the probability that hake will score 65% or less on a 100 question test

Answer 1

Mean = 75

Random score = 65

Standard deviation = -10

Z-score = Score - Mean / Standard Deviation

= ( 65 - 75 ) / -10

= -10 /10

= -1

Probability ( Z < -1 ) = 0. 3413 ( from the Z-score table)