2 Answers By Expert Tutors
By:
Rich G. answered 04/03/20
Tutor
5.0 (142)
Six Sigma Green/Black Belt with years of Statistics Experience
There are Z tables that show the positive side, if you do a search on Z table you can find some online.
I found one that shows the following:
Z valueTable entry
0.670.7486
0.680.7517
So the Z value for 0.75 is somewhere between 0.67 and 0.68.
If we interpolate we find that the z value is 0.6745
If you have a TI-84 calculator you can find the z value:
- 2nd - VARS (this will show the DISTR menu)
- Press 3 to select invNorm
- Enter the area/table value (0.75)
- Press enter and it will return the z value
Meagan W.
That's awesome! I was scouring, but could not seem to find one. Maybe it was because I was on my phone. That is much easier, thank you Rich.04/03/20
Meagan W. answered 04/03/20
Tutor
5.0 (89)
Up To Date on Your Statistics Needs
Hello Anthony,
In order to find the answer to this question you need a z-table. Since we're looking at the top 75th percentile, but there's no 0.75 on a z-table, we are looking at the last 25% of the curve. If you look for the closest thing to 0.25 (25%÷100) on your z-table under the "beyond the tail" column, you see that the corresponding z-score is 0.67. To draw this chart, you need to shade in the area under the curve representing the 75th percentile which I can't show on here.
Thanks,
Meagan
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