Homework Help: Math

Posted by Andrew on Friday, January 7, 2011 at 12:02pm.

If you toss a pair of dice 1,000 times, how many times would you expect to get a sum of 12 as the result?

1.)about 12 times
2.)about 27 times
3.)about 36 times
4.)about 100 times

The lesson doesn't show me how to work this. Whats the formula?

Math - Reiny, Friday, January 7, 2011 at 7:12pm
the prob of getting 12 when tossing 2 dice = 1/36

so the number expected doing this 1000 times
= 1000 x 1/36 = 250/9
= 27.777

so it would happen approx 28 times.
Math - Anonymous, Tuesday, September 11, 2012 at 10:11am
If you toss 3 coins 10,000 times, how many times would you expect that exactly 2 heads appear?

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