Posted by **anonymous** on Tuesday, June 18, 2013 at 1:27am.

Jenny places 100 pennies on a table, with 30 showing heads and 70 showing tails. She chooses 40 distinct pennies uniformly at random and turns them over. That is, if a chosen penny was showing heads, she turns it to show tails; if a chosen penny was showing tails, she turns it to show heads. After this process, what is the expected number of pennies showing heads?

## Answer this Question

## Related Questions

- Math - Suppose there are 500 pennies in a row... (math problem)? The pennies are...
- MATH - some pennies were on the table.erin saw that 56 were heads up and 44 were...
- math - Three pennies are tossed into the air.What is the probability they will ...
- math - You are going to toss 2 pennies 20 times. Make a prediction. how many ...
- algebra 2 - if someone offers to pay you 1 penny on the first day, 2 pennies on ...
- math - A child's coin bank contains $2.58 in pennies and nickels. If the number...
- Math: Probablity - A penny, a nickel, and a dime are flipped at the same time. ...
- Math-Probability - Consider a collection of n biased coins, each showing Heads ...
- Math-Probability - Consider a collection of n biased coins, each showing Heads ...
- Math-Probability - Consider a collection of biased coins, each showing Heads ...

More Related Questions