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Unformatted text preview: z 2 = 301 . 5300 3 = 0 . 5 Using Table A, the answer is . 6915. 1587 = . 5328, or 53.28%. (c) The area to the left of x is .25. The closest value to .25 in the body of Table A is z =. 67. Thus, x300 3 =. 67 x300 = 3(. 67) x = 300 = 3(. 67) x . = 298 3. The mean is: ¯ x = 80 + 90 + 100 3 = 90 The standard deviation is: s = r (8090) 2 + (9090) 2 + (10090) 2 31 = r 200 2 = √ 100 = 10 4. (a) Split stems should be used in the stemplot. 19 9 20 023 20 7889 21 0000234 21 578 22 1 (b) The ﬁvenumber summary is: 199 207 210 214 221. 5. (a) Group 1 had the larger median pulse rate. (b) Between 75 ( Q 1 ) and 110 ( Q 3 )....
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This homework help was uploaded on 04/02/2008 for the course STAT 145 taught by Professor Allstats145 during the Summer '07 term at New Mexico.
 Summer '07
 AllStats145
 Statistics

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