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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. 599585574572569565564551539534531528525524519501488480478475471465458443427410409389380382355314\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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