Posted by **Sam** on Tuesday, November 22, 2011 at 11:34pm.

Emily surmises that the probability tht she will pass math or chemistry is .95, the probability of her passing math is .7, and the probability of passing both is .55. Find her estimate of the probability of passing chemistry?

- math -
**Reiny**, Wednesday, November 23, 2011 at 12:26am
how about making a Venn diagram using 2 intersecting circles.

Place .55 in the intersection of the two.

Prob of passing math is .7 , but you already have put .55 in the math circle, that leaves .15 to go in the non-overlapping part of math

label the non-overlapping part of chemistry as x

then

x = .55 + .15 = .95

x = .25

so prob of passing chemistry is .55 + .25 = .8

## Answer this Question

## Related Questions

- Statistics - Bart is taking two classes, backpacking and biology. His ...
- math - Elin estimates her probability of passing French 0.6, passing chemistry ...
- Math - On tuesday you all took the science and then your social studies final ...
- stats again - ok I get it, so once I get the prob figred for one person, how do ...
- Probability - 4.3. In a certain college town, 27.5 percent of the students ...
- Probability - What is the probability of passing a 10-item multiple choice quiz...
- Probability/Statistics - A quiz consists of 10 multiple-choice questions, each ...
- Finite Math - A quiz consists of 10 multiple-choice questions, each with 5 ...
- probability - The probability that a student passes Biology is 0.35 and the ...
- probability-April - The probability that a student passes Mathematics is 2/3 and...