Suppose the shutter life of a population of DSLR cameras are normally distributed with an unknown population mean and a population standard deviation of 5,000 cycles. A random sample of DSLR cameras from the population produces a sample mean shutter life of x¯=89,200 cycles.

What value of z should be used to calculate a confidence interval with a 80% confidence level?

You drop a rubber ball off the roof of a 50 meter high building onto a paved parking lot. it bounces back up with every bounce, but not quite all the way back up to you. after the first bounce it bounces back only 80 percent of the distance it was dropped from. the pattern continues, meaning after every bounce it comes up to just 80 percent of the previous maximum height. so if before the first bounce the height is 50 meters, what height does the ball reach after the fifth bounce? round your answer to one decimal place and chose the correct response from the choices below:

Drag the tiles to the correct boxes to complete the pairs. not all tiles will be used. identify the domain for each of the given functions.

Solve the following pair of equations for x and y: ax/b_ by /a= a +b; ax - by = 2ab