Posted by **mike** on Friday, July 22, 2011 at 8:31pm.

Two dice are rolled and two fair coins are tossed. Let X be the sum of the number of spots that show on the top faces of the dice and the number of coins that land heads up. The expected value of X is _____ .

- statistics -
**bobpursley**, Friday, July 22, 2011 at 9:02pm
Well, the die are independent.

expected dots from one die:1/6(1+2+3+4+5+6)=21/6

expected sum:= 42/6=7

expected number of heads: 1/2 * 2

expected value of X is 8

- statistics -
**Bruno**, Tuesday, June 5, 2012 at 7:47pm
A lottery offers one $900 prize, one $600 prize, three $400 prizes, and five $100 prizes. One thousand tickets are sold at $6 each. Find the expectation of a person buys five tickets.

## Answer This Question

## Related Questions

- statistics - Two dice are rolled and two fair coins are tossed. Let X be the sum...
- statistics - 2. Two fair dice are rolled at the same time and the number of dots...
- Probablity - Two dice are tossed simultaneously. What is the probability that “...
- statistics math - two un biasedtetrahedral dice each have four faces number 1,2,...
- math - A specially made pair of dice has only one- and two-spots on the faces. ...
- algebra - two dice are rolled. if a 3 appears on either dice,then the two dice ...
- statistics - 5. Consider the probabilities in problem 4. The probability that a...
- math - If two dice are rolled and their faces noted, find each of the following ...
- statistics - Five coins all balanced the same were tossed 150 times. Note that, ...
- MATHS - Three fair coins are tossed at the same time. What is the probability ...

More Related Questions