Use technology to find the probability associated with the cumulative area to the left of the z score of the adjusted value of x, 4.5 rounding to four decimal places. P(z

Question

Use technology to find the probability associated with the cumulative area to the left of the z score of the adjusted value of x, 4.5 rounding to four decimal places. P(z<-0.7907)=0.2146 

I am just unsure of how to get the 0.2146 from the P(z<-0.7907).

boldjon · Answer

hm let me ask my friend google he might know

boldjon · Answer

he's being a booch today, sorry can't help u

mathmale · Answer

Sounds as tho' you're supposed to evaluate this probability using your calculator.  Would you happen to have access to a TI-83 or -84?

anonymous · Answer

Lol! Thanks anyway, Boldjon. I don't have either, but my professor told us that we shouldn't need one. :/

reemii · Answer

I checked that it is correct using a table of quantiles. Is it considered technology?

What is this `4.5` in the statement?

mathmale · Answer

If we focus on P(z<-0.7907)=0.2146 alone, not considering what that '4.5' represents, then our task is to find the area under the standard normal curve to the left of z=-0.7907. If you don't have a suitable calculator, then your best (and perhaps only) bet is to use a z-score table. Use the one that displays negative z scores, corresponding to areas to the left of the mean of your standard normal distribution. Find "-0.7" in the leftmost column, and then 0.09 or 0.091 in the topmost row. In the body of the table, underneath, you should see 0.21 or something similar. Do you have a table of z-scores available? If not, please have a look at these search results: http://www.bing.com/search?q=z-score+chart&src=IE-SearchBox&FORM=IESR02&pc=EUPP_UE02 Let me know how this works out for you.