You have found the following ages (in years) of all 5 meerkats at your local zoo:

5,2,2,3,14

What is the average age of the meerkats at your zoo? What is the standard deviation? You may round your answers to the nearest tenth.

@johnweldon1993 do you know anything about this? :S

Question

You have found the following ages (in years) of all 5 meerkats at your local zoo:

5,2,2,3,14

What is the average age of the meerkats at your zoo? What is the standard deviation? You may round your answers to the nearest tenth.


@johnweldon1993 do you know anything about this? :S

johnweldon1993 · Answer

Well first...what is the average?

anonymous · Answer

Any idea how do calc the avg?

anonymous · Answer

@johnweldon1993 Looks like you got this?

anonymous · Answer

5.2?

johnweldon1993 · Answer

yeah no problem @taljaards

johnweldon1993 · Answer

Correct @hemmohgosh5sos 

so now...for the standard deviation...

johnweldon1993 · Answer

you take the average...(5.2) and you subtract every number up there from it...

We want the difference between every number and the average...so

for example...with 14

5.2 - 14 = ?

johnweldon1993 · Answer

might want to check your math again @rgalli1

anonymous · Answer

-8.8

johnweldon1993 · Answer

So we want to answer all of those @hemmohgosh5sos 

5.2 - 5
5.2 - 2
5.2 - 2
5.2 - 3
5.2 - 14

answer all those for me :)

anonymous · Answer

5: 0.2
2: 3.2
2:3.2
3: 2.2
14: -8.8

correct?

johnweldon1993 · Answer

Correct :)

so now...we take every one of those results...and square them

.2^2 = ?
3.2^2 = ?

etc....give me all those results ...  :)

anonymous · Answer

.04
10.24
10.24
4.84
-77.44

johnweldon1993 · Answer

everything but 1 is correct...

(-8.2)^2 = 77.44   not negative :)

Alright so we have

$$\large .04 , 10.24, 10.24, 4.84, 77.44$$

Add all of those up...

anonymous · Answer

oh my bad lol
but its 103.16. :) right?

johnweldon1993 · Answer

not...quite what i get...do it 1 more time :) I could be wrong so I will too :)

johnweldon1993 · Answer

Yeah I get 102.8

johnweldon1993 · Answer

is that what you get @hemmohgosh5sos

anonymous · Answer

i got 103.16 again. hmmm let me try one more time

johnweldon1993 · Answer

You're doing .4 not .04 :P

anonymous · Answer

you're right, lol my mistake

johnweldon1993 · Answer

:D

alright so we have

102.8

we divide that by 5 (yes like taking the average)

anonymous · Answer

20.56

johnweldon1993 · Answer

right...and this what we have now

20.56   is the variance....to find the standard deviation....we just take the square root of the variance...so

$$\large \sqrt{20.56} = ?$$

anonymous · Answer

4.534

johnweldon1993 · Answer

right! and rounded to the nearest tenth...?

anonymous · Answer

it would just be 4.5 though right?

johnweldon1993 · Answer

^Indeed :)

And that is your answer :)

anonymous · Answer

thank you again, you're a life saver!!!

johnweldon1993 · Answer

Anytime hun :)

anonymous · Answer

can i try a few more and you correct me if im wrong? if not its alright!