Evan collected data about the amount of time each student in his math class spends studying. if the range of these data is 2, what does this reveal about the data?

all the students in his math class spend exactly 2 hours studying.

all the students in his math class spend an average of 2 hours studying.

the smallest and largest data values are 2 units away from each other.

the middle data value for time spent studying by all students in his class is 2 hours.

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.