Movie theater tickets in a region have a mean cost of $8.32 and a standard deviation of $0.76. What is the approximate standard deviation of the sampling distribution of the mean for samples of size 30?

Find the midpoint m of z1=(8+5i) and z2=(12+3i)

Money off coupons have been circulated to 300 households. only 2/5 of these were redeemed (used) in the local supermarket to get a free shampoo. what fraction of coupons were unused? (ps: write how you got the answer)

I'm at a bookstore with $\$35$ in my pocket and a $20\%$-off coupon. what is the cost of the most expensive book i can buy with my money and the coupon? (assume that there are books of every possible price in the bookstore. it's a large bookstore! )