Twenty students participated in a psychology experiment which measured their heart rates in two different situations.

a. What are the appropriate measures of center and variability to use with the data? Select all that
apply for the data above.
-mean
-median
-mode
-IQR
-range
-standard deviation
and explain why

the answer is 0.071

good luck! : d

you are playing an adventure game on your computer. you come across a troll who won't let you pass and there is no other way to get to the other side of the river except over the bridge he is guarding.

the troll is a nerd. he takes great delight in watching people struggle with his problems. very few get them. he only gives you one chance and then he changes the puzzle. you have to solve this one.

before you are four blocks. they are numbered 11,6, -7,21.

he tells that the answer he wants is minus and between -1 and - 2. you can use +, -, ×, ÷   ( and ) as many times as you like or no times at all. you don't like the way he's looking at you, but you need to cross the bridge. what do you do?