This post is to check understanding of normal distributions when students are required to standardise. Note that the answers given are from using the normal table to look up P(Z < z), not a calculator method.

a) The student mixed their units and so ended up with an incorrect z value

b) Correct answer

c) Student used the standardised value as the probability

d) Student made an error in the standardising formula (rather than X – μ, student did μ – X)

e) Student looked up the value given (1.45) rather than standardising

In case you wondered; this is for a different class 😉

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