Friday

March 27, 2015

March 27, 2015

Posted by **Heidi** on Wednesday, July 9, 2014 at 4:32pm.

15 years was chosen randomly. Find the probability that,

(1) Exactly four of these years have a New Year's day on a Saturday.

(2) At least two of these years have New Year's day on a Saturday.

- Statistics/Probability -
**Reiny**, Wednesday, July 9, 2014 at 5:19pmprob(Saturday) = 1/7

prob(not Saturday) = 6/7

prob(exactly 4 of 15 years is a Saturday)

= C(15,4) (1/7)^4 (6/7)^11

= appr .1043

at least 2 Saturdays ----> 1 - (case of 0 Saturday + case of 1 Saturday)

= 1 - (6/7)^15 - C(15,1)(1/7)(6/7)^14

= .6534

check my arithmetic

**Answer this Question**

**Related Questions**

Probability and statistics - The probability that the life time of randomly ...

finite math - The probability that a 3-year old garter snake will reach 4 years ...

finite math - The probability that a 3-year old garter snake will reach 4 years ...

finite math - The probability that a 3-year old garter snake will reach 4 years...

COLLEGE MATH - In 2003, the probability that a randomly chosen bag of cement ...

Probability and statistics - 5. The probabilities that the lifetime of a ...

Statistics - A life insurance company sells a term insurance policy to a 21-year...

MATH - (4 pts) The score on an exam from a certain MAT 112 class, X, is normally...

Math 132 - There are 7 girls and 6 boys in a class. Suppose five children are ...

math - 2) In a certain instant lottery game, the chances of a win stated as "3 ...