SOLUTION: past experience suggest that 43% of students pass a certain exam. If a class contains 150 students, what is probability that 50 or fewer students will pass?

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Question 919769: past experience suggest that 43% of students pass a certain exam. If a class contains 150 students, what is probability that 50 or fewer students will pass?
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
sample p = 50/150 = .33
z = (.33 - .43) /sqrt(.43*.57/150) = -.10/.04 = -2.4739
P(x ≤ 50) = P( z < -2.4739) = normalcdf(-100, -2.4739) = .0067 0r .67%