You install 2 new light bulbs: a 60 watt bulb and a 100 watt bulb. Let X be the lifetime of the 60 watt bulb and Y the lifetime of the 100 watt bulb. The package says that the expected lifetime of the 60 watt bulb is an exponential random variable with mean 200 days while the lifetime of the 100 watt bulb is an exponential random variable with mean 100 days. a) Write down the PDFs of X and Y. b) Compute the CDFs of X and Y. c) If fx is the PDF of X and Fy is the CDF of Y then P(X

What are the values of each variable in the diagram below?

Suppose babies born after a gestation period of 32 to 35 weeks have a mean weight of 25002500 grams and a standard deviation of 800800 grams while babies born after a gestation period of 40 weeks have a mean weight of 27002700 grams and a standard deviation of 385385 grams. if a 3232-week gestation period baby weighs 21252125 grams and a 4040-week gestation period baby weighs 23252325 grams, find the corresponding z-scores. which baby weighs lessless relative to the gestation period?

The perimeter of a quarter circle is 14.28 miles. what is the quarter circle's radius?