SOLUTION: If 30 percent of people use the library in one year find the probabilities for a sample of 15 people A. At most 7 used the library B. exactly 7 used the library C. At least 5 us

Question 862887: If 30 percent of people use the library in one year find the probabilities for a sample of 15 people
A. At most 7 used the library
B. exactly 7 used the library
C. At least 5 used the library
Answer by Edwin McCravy(20060) (Show Source): You can put this solution on YOUR website!
If 30 percent of people use the library in one year find the probabilities for a sample of 15 people
A. At most 7 used the library

On your TI-83 or 84

Press 2ND
Press VARS
Scroll down to binomcdf(
Press ENTER

If you have a newer TI calculator, enter
      trials:15
      p:.3 
      x value:7
      Highlight Paste
      Press ENTER 
      Press ENTER again

If you have an older TI calculator, make it read

binomcdf(15,.3,7)

Press ENTER

You read .9024761739


--------------------------

 B. exactly 7 used the library

Same as above, except this time,
Scroll down to binompdf(, instead of binomcdf( 

.0811300333

--------------------------

C. At least 5 used the library

That's the complement of 4 or fewer.

So find

binomcdf(15,.3,4) as above.

Get .5154910592

Subtract from 1

.4845089408  <-- final answer

Edwin

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