The standard deviation of the lifetimes of a sample of 200 electric light bulbs was computed to be 100 hours. find (a) 95% and (b) 99% confidence intervals for the standard deviation of all such light bulbs.

Abag contains 3 red marbles, 2 blue marbles, and 2 green marbles. one marble is picked, then another marble. assume that the selections are made with replacement. a) find the probability of picking two red marbles with replacement. b) find the probability of picking a red marble and a blue marble. assume the selections are made without replacement. c) find the probability of picking two red marbles without replacement. d) find the probability of picking a red marble and a blue marble without replacement.

Find the ratios of the corresponding sides

Rewrite 9 log, x2 in a form that does not use exponents. 9log, x = log, x