What is the probability that the mean price for a sample of 300 H&R Block retail customers is within $12 of the population mean (i. e. +/- 12) ? The mean preparation fee H&R Block charged retail customers in 2011 was $183 (The Wall Street Journal, March 7, 2012). Use this price as the population mean and assume the population standard deviation of preparation fees is $45.

If sin(x) = 0 and cos(x) = 1, what is tan(x)?

The management of a supermarket wants to adopt a new promotional policy of giving a free gift to every customer who spends more than a certain amount per visit at this supermarket. the expectation of the management is that after this promotional policy is advertised, the expenditures for all customers at this supermarket will be normally distributed with a mean of $95 and a standard deviation of $20. if the management wants to give free gifts to at most 10% of the customers, what should the amount be above which a customer would receive a free gift?

Which angle has the same measure as the dehedral angle formed by the orange face and the purple rectangle