Here Are the Average Mathematics Achievement Scores for Ninth Graders

question 40

Multiple Choice

Here are the average mathematics achievement scores for ninth graders in 32 counties.Find the standard deviation. $$\begin{array} { l l l l l l l l } 599 & 585 & 574 & 572 & 569 & 565 & 564 & 551 \\539 & 534 & 531 & 528 & 525 & 524 & 519 & 501 \\488 & 480 & 478 & 475 & 471 & 465 & 458 & 443 \\427 & 410 & 409 & 389 & 380 & 382 & 355 & 314\end{array}$$

• A)75.3
• B)75
• C)73.3
• D)74.3
• E)75.5

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