The lifetime of a certain type of light bulb can be approximated by a normal distribution. The list gives the number of days a bulb can last for 10 light bulbs selected at random. Find the mean and standard deviation of the data set. Then sketch a normal curve to represent the distribution. 24, 24, 32, 13, 22, 34, 20, 26, 17, 28

The lengths of nails produced in a factory are normally distributed with a mean of 4.91 centimeters and a standard deviation of 0.05 centimeters. find the two lengths that separate the top 4% and the bottom 4%. these lengths could serve as limits used to identify which nails should be rejected. round your answer to the nearest hundredth, if necessary.

One line passes through (-7,-4) and (5,4) . another line passes through the point (-4,6) and (6,-9)

What is the greatest number of parts of a circle that can be formed by cutting the circle with 7 straight cuts? (note: the parts do not have to be equal in size)