livestock cooperative reports that the mean weight of yearling Angus steers is 1107 pounds. Suppose that the weights of all such animals can be described by a Normal model with a standard deviation of 93 pounds. ​a) What percent of steers weigh over 1200 ​pounds? ​b) What percent of steers weigh under 1300 ​pounds? ​c) What percent of steers weigh between 900 and 1100​pounds? ​a) nothing​% of steers have weights above pounds.

Suppose we have a set of small wooden blocks showing the 26 letters of the english alphabet, one letter per block. (think of scrabble tiles.) our set includes 10 copies of each letter. we place them into a bag and draw out one block at a time. (a) if we line up the letters on a rack as we draw them, how different ways coukl we fill a rack of 5 letters? (b) now suppose we just toss our chosen blocks into a pile, and whenever we draw a letter we already have, we put it back in the bag and draw again. how many different piles of 5 blocks could result? possible? piles will contain at least one repeated letter? (c) if we draw out 5 blocks wit hout looking at them, how many different piles are (d) if we draw out 5 blocks without looking at them, how many of the possible 2. (4) consider the following formula. 12 give two different proofs, one using the factorial formulas and the other combina torial.