You have a weighted coin that lands on heads with probability 0.8. You flip it 1000 times. a. What’s the mean of number of times you flip heads?
b. What’s the standard deviation of number of times you flip heads?
c. What’s the probability that you are within one standard deviation of the mean?

Suppose i flip two identical coins. what is the probability that i get one head and one tail?

Erinn wrote the equation –5x + 4y = 32 to represent her hourly wage (y) and how this wage has changed during each year that she worked at a company (x). what is the rate of change in erinn's hourly wage per year?

Afamily has two cars. the first car has a fuel efficiency of 25 miles per gallon of gas and the second has a fuel efficiency of 15 miles per gallon of gas. during one particular week, the two cars went a combined total of 1025 miles, for a total gas consumption of 55 gallons. how many gallons were consumed by each of the two cars that week?