In a recent study of animal sleep times at the zoo, the mean amount of sleep per night is 6.3 hours with a standard deviation of 2.1. If 23 animals are selected, find the probability that the mean sleep time per night is greater than 8 hours.

A pair of shoes costs $45.95. There is 9.5% sales tax on it. How do you estimate the total bill to check for reasonableness? Take of $50 and add the result to $50. Multiply 45.95 by 9. Add 50 and 10. Divide 45.95 by 100, and multiply the result by 9.

Determine if the number 5.1x10^-8 is written in scientific notation

2. 2x2 + 2x - 112 factor

The sine of 72 degrees is 0.95. what's the cosine of 18 degrees

V = 4 3 πr3 . Leah has two congruent beach balls. The diameter of one ball is 20 inches. Which choice is the closest for the volume of the second ball?

According to a survey, 76% of girls participate in swimming. If there were 200 girls surveyed, how many participate in swimming?

When x is divided by 3 the quotient is more than 7

I am a polygon I am a quadrangle all my sides are the same length none of my angels are right angels. What am I

If p is true and q is false, then p ∨ q is true. A. True B. False

Simplify the following: 6x - 6y + 4x - 3y - 5x + 7x