Question

how does P(Z < -2) ~ 0.23 ? what equation was used?

how does P(Z < -2) ~ 0.23 ?
what equation was used?

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Answer #1

Use this link to get the table of the Standard Normal Cumulative Distribution Function

https://math.ucalgary.ca/files/math/normal_cdf.pdf

To use the table

example z=-2

a)Look for z=-2.0 in the first column.

b)Find z= 0.00 in the first row.

c) Find the intersection of corresponding row and column.

d) Take the value. Here it is 0.0228 (approx 0.023).

This value will give P(z<-2) if z is a standard normal random variable.

Please upvote if you understood the solution.

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