Question

Question 1.1. Which variable is discrete?
(Points : 5)
time to finish a race

length of race in kilometers

number of runners in race

temperature at start of race

Answer 1

Well an example of a discrete variable is for example timing something down to the exact milisecond

Answer 2

It is also a number that is found by counting. A continuous variable is found by measuring

Answer 3

So the right answer would be C because the # of runners is found using a matter of counting not by measuring.

Answer 4

Question 5.5. Which is the approximate standard deviation of the data set?

{5, 12, 15, 10, 12, 6, 8, 8}

(Points : 5)
3.4

3.9

4.8

5.0

Answer 5

This is the equation for standard deviation

Answer 6

So you want to find the mean or the average of all the numbers

Answer 7

aha...

Answer 8

The average is all the numbers added up divided by the amount of numbers. In this case the average is 9.5

Answer 9

hmm but that's not one of the answer choices.

Answer 10

I have the same question fr.

Answer 11

Well we are not done yet

Answer 12

\[\sqrt{\frac{ (5-9.5)^2+(12-9.5)^2+(15-9.5)^2+(10-9.5)^2+(12-9.5)^2+(6-9.5)^2+(8-9.5)^2+(8-9.5)^2 }{ 8 }}\]

Answer 13

oops...

Answer 14

Anyways... The answer is 3.4

Answer 15

thank you! :)

Answer 16

Yup!