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So I was preparing for an entrance test and the study material provided by the institution has a lot of mistakes .Please forgive me if this seems off topic.

I just know high school maths and I am studying Normal Distributions for the first time and I want to ensure whether there is a misprint in the book for this fact in the image(in red box).

enter image description here

For all I know this is a contradiction simply due to misprint.Am I right or wrong.And if wrong,why?

P.S.:Also any other online resource to learn normal distributions would be helpful if anyone knows one.

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  • $\begingroup$ 14.26 is correct and 14.31 is indeed a misprint. $\endgroup$
    – drhab
    Jun 8, 2016 at 11:44
  • $\begingroup$ @drhab Thanks a lot! $\endgroup$ Jun 8, 2016 at 12:07
  • $\begingroup$ Do you mean $z\sim\frac{x-\mu}{\sigma}$? $\endgroup$
    – robjohn
    Jun 8, 2016 at 14:14
  • $\begingroup$ @robjohn I did not understand what you mean.I thought there was a mistake in the book that is shown in red boxes.The other things I already have understood. $\endgroup$ Jun 8, 2016 at 14:44
  • $\begingroup$ That was answered by drhab, but I was just looking at your formula that says $z=x-\mu/\sigma$, which looks wrong, also. It could have been a typo in the book, or a typo in your MathJax. $\endgroup$
    – robjohn
    Jun 8, 2016 at 15:11

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