Here are the average mathematics achievement scores for ninth graders in 34 counties.Find the standard deviation. $$\begin{array} { l l l l l l l l l }
595 & 588 & 587 & 586 & 582 & 580 & 561 & 555 & 551 \
548 & 542 & 540 & 538 & 537 & 534 & 532 & 524 & 523 \
515 & 512 & 501 & 498 & 493 & 489 & 485 & 483 & 465 \
462 & 458 & 444 & 435 & 431 & 407 & 380 & &
\end{array}$$
A)55.8
B)57.5
C)54.2
D)56.2
E)55.2

Question

Here are the average mathematics achievement scores for ninth graders in 34 counties.Find the standard deviation. $$\begin{array} { l l l l l l l l l } 
595 & 588 & 587 & 586 & 582 & 580 & 561 & 555 & 551 \
548 & 542 & 540 & 538 & 537 & 534 & 532 & 524 & 523 \
515 & 512 & 501 & 498 & 493 & 489 & 485 & 483 & 465 \
462 & 458 & 444 & 435 & 431 & 407 & 380 & &
\end{array}$$
A)55.8
B)57.5
C)54.2
D)56.2
E)55.2

Quizplus · Accepted Answer

The standard deviation is a measure of how spread out the data is. A smaller standard deviation means that the data is more clustered around the mean, while a larger standard deviation means that the data is more spread out. In this case, the standard deviation is 55.2, which means that the data is fairly spread out.

Here Are the Average Mathematics Achievement Scores for Ninth Graders