OpenStudy (anonymous):

Chet is applying to both NYPD and CSI. The probability that he gets into NYPD is 0.6. The probability that he gets into CSI is 0.7. The probability that he gets into both is 0.4. What is the probability that he gets in to only NYPD?

5 years ago
OpenStudy (anonymous):

@jim_thompson5910 I got 0.2....

5 years ago
OpenStudy (anonymous):

the options are .1 .2 .3 .4 .5

5 years ago
OpenStudy (anonymous):

And I'm having troubles with this one: On the math portion of the SAT, the mean score was 510 with a standard deviation of 95. On the verbal portion, the mean score was 530 with a standard deviation of 85. We now know the mean of the combined score is 1040 with a standard deviation of 127.48. Given that these are normal distributions, we can do normal calculations with the combined statistics. What is the probability that a random student scored 1100 or better? 0.3189 1.2232 1.987 2.302

5 years ago
jimthompson5910 (jim_thompson5910):

|dw:1363035571468:dw|

5 years ago
OpenStudy (anonymous):

I made a venn diagram and got .2

5 years ago
OpenStudy (anonymous):

as my answer?

5 years ago
jimthompson5910 (jim_thompson5910):

the probability of getting into both is 0.4, so |dw:1363035691373:dw|

5 years ago
jimthompson5910 (jim_thompson5910):

for CSI only, you do 0.7 - 0.4 = 0.3 so that goes in the right circle

5 years ago
jimthompson5910 (jim_thompson5910):

|dw:1363035737526:dw|

5 years ago