MDM4U z-Score homework


Here’s the table I like to use:

http://www.stat.ufl.edu/~athienit/Tables/Ztable.pdf

Your homework:

  1. \mu = 15 , \sigma = 2.5 , find P(X>14) .
  2. \mu = 100 \sigma = 5.8 , find P(95<X<98) .
  3. \mu = 50 \sigma = 10 , find x such that P(X>x)=22% .

Sorry, that’s a bit hard to read on a dark background.

Answers:

  1. 0.6554=65.54%
  2. 0.172=17.2%
  3. 42.3 (not a percentage)
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