I desperately need help with 6 problems on the Empirical Rule.
Suppose a random sample of 500 individuals were give $75 to use in an Atlantic City casino. After two hours the mean amount of money to 500 individuals had was $50.
Also, the z-score for the dollar amount is $25 is equal to -2.5.
1. What is the numerical value of xbar (mean)?
2. What is the numerical value of s (stand. dev.)?
3. Sixty-eight percent of all dollar amounts are between which two values?
4. Ninety-five percent of all dollar amounts are between which two values?
5. What percentage of dollar amounts is smaller that $40?
6. What percentage of z-scores is between -1 and +2?

Question

I desperately need help with 6 problems on the Empirical Rule.
Suppose a random sample of 500 individuals were give $75 to use in an Atlantic City casino. After two hours the mean amount of money to 500 individuals had was $50. 
Also, the z-score for the dollar amount is $25 is equal to -2.5.
1. What is the numerical value of xbar (mean)?
2. What is the numerical value of s (stand. dev.)?
3. Sixty-eight percent of all dollar amounts are between which two values?
4. Ninety-five percent of all dollar amounts are between which two values?
5. What percentage of dollar amounts is smaller that $40?
6. What percentage of z-scores is between -1 and +2?