Find the area under the standard normal curve that lies between

Question

z = −2.30 and z = 1.08

Answer 1

If you have a TI-84 calculator, Do the blue "2nd" button then "vars" (which is "distr"), scroll down to "2:normalcdf("

For "lower", type "-2.30"

For "upper", type "1.08"

For "μ", type "0" (zero)

For "σ", type "1"

Then scroll to "Paste" and hit "enter", then "enter" again and your calculator will give you the answer.

If you need to use a table:

Look up the standard normal distribution value for a z-score of -2.30 which you will find is "0.01072"

Then look up the standard normal distribution value for a z-score of 1.80 which you will find is "0.96407" and subtract the two to get your answer.