The Phillips Bangladesh manufactures electric bulbs that have a length of life that is normally distributed with mean equal to 550 hours and standard deviation of 25 hours. Find the probability that a bulb burns between 585 and 645 hours.

Which value is not a solution of 8x^3 – 1 = 0

Ntriangle abc, m∠a = 35° and m∠b = 40°, and a=9. which equation should you solve to find b?

Use the given degree of confidence and sample data to construct a confidence interval for the population mean mu . assume that the population has a normal distribution. a laboratory tested twelve chicken eggs and found that the mean amount of cholesterol was 185 milligrams with sequals 17.6 milligrams. a confidence interval of 173.8 mgless than muless than 196.2 mg is constructed for the true mean cholesterol content of all such eggs. it was assumed that the population has a normal distribution. what confidence level does this interval represent?