6. (6 pts) The batteries used by a calculator have useful lives that follow a normal distribution, with a mean of 1000 hours and a standard deviation of 200 hours. (a) Find the range of middle 95% batteries useful life. (b) A random sample of 100 batteries is drawn. Find the range of middle 95% sample means of batteries useful life.

If you are trying to move an attached term across the equal sign (=), what operation would you use to move it?

The total ticket sales for a high school basketball game were $2,260. the ticket price for students were $2.25 less than the adult ticket price. the number of adult tickets sold was 230, and the number of student tickets sold was 180. what was the price of an adult ticket?

What is the probability of throwing several dice with sum equal to 6 (six)? show the ways of possibilities for sum 6 (as the numerator) and the ways of throwing n dices for n = 1, 2, 3, 4 or 5 as denominator for all the questions to earn full credits. (a)throw one die, (b) throw two dice, (c) throw three dice (d) throw 4 dice, (e) throw 5 dice