which of the following choices is the standard deviation of sample shown here? 17,18,19,20,21 A,19 B,2 C,2.2 D, ^2 E,^2.5

Question

which of the following choices is the standard deviation of sample shown here? 17,18,19,20,21     A,19       B,2      C,2.2     D, ^2      E,^2.5

anonymous · Answer

It is sample sd and so, division is by 4. The answer is D

mathmate · Answer

Do you mean
$$D, \sqrt 2\  \ E, \sqrt{2.5})$$

anonymous · Answer

yea im pretty sure thats what they meant. its the only thing that makes sense.

anonymous · Answer

YEA HOW DO YOU DO THAT ???

mathmate · Answer

BTW, division by 4 does not give D.

anonymous · Answer

IT WOULD BE E^2.5

mathmate · Answer

You would type \ [\ s q r t 2\ ]
but skip the spaces after the first and last \

anonymous · Answer

i meant E. sorry

mathmate · Answer

or better, go to the latex practising forum at openstudy.

mathmate · Answer

$$ \sqrt{\frac{1^2+2^2+2^2+1^2}{4}}=\sqrt{5/2}=\sqrt{2.5}$$

anonymous · Answer

THANKS

mathmate · Answer

You're welcome!   :)