Saturday

January 31, 2015

January 31, 2015

Posted by **Neid** on Tuesday, April 29, 2014 at 8:19pm.

- Math -
**Damon**, Tuesday, April 29, 2014 at 8:29pmThe concept of a 15 sided cube startles me.

Did you make this question up yourself?

- Math -
**Neid**, Tuesday, April 29, 2014 at 8:38pmNo, it's a question on a 7th grade Skills Review

- To Damon -
**Steve**, Tuesday, April 29, 2014 at 8:39pmYou are right; there's no way a 15-sided die could be fair. Even if the area of each face is the same, the angles cannot all be equal, since there is no regular 15-hedron.

- Math -
**Damon**, Tuesday, April 29, 2014 at 8:52pmPerhaps they want us to assume it is possible.

4 out of the 15 sides are less than 5

so

about 4/15 in each roll

so in each roll the probability of NOT getting less than 5 is 11/15

so the probability of NEVER getting less than 5 is (11/15)^45

so our answer is

1 - (11/15)^45

which is about

1 - 8.7^-7

which is so close to one that you can count on it :)

**Answer this Question**

**Related Questions**

Algebra - Mack is 3 times as old as Justin. In 3 years, Mack's age will be 5 ...

algebra - cube labeled 1 to 6 rolls 450 times. predict rolling less than 3

Math 221 Week3 - A probability experiment consists of rolling a 6 sided die. ...

Advanced algebra - In which distributions does the variable, X, have a binomial ...

Advanced algebra - In which distributions does the variable, X, have a binomial...

english - Which is the correct pronunciation of machines? a. MACK-ines b. mack-...

Math help - You roll a standard, six sided number cube. what is the probability ...

math (cant figure it out) - 3. A number cube is rolled 120 times. The number 4 ...

math - a number cube is rolled 150 times. the number 3 comes up 43 times. hat is...

Math - What is the probability of rolling a number less than 5 on a toss of a ...