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Unformatted text preview: Assignment #1 MAT H 203 2.29 a) Calculations : 14+19+15+11+8=67% By summing the relative frequencies in the intervals 1.51.7, 1.71.9, 1.92.1, 2.12.3, and 2.32.5 we can conclude that 67% of the 2,929 aftershocks were between 1.5 and 2.5 on the Richter scale. b)By summing the relative frequencies in the intervals between 3.0 and 7.0 we can conclude that approximately 13% of the 2,929 aftershocks were above 3.0. 2.37 2.59 Ammonia 1.53 1.50 1.37 1.51 1.55 1.42 1.41 1.48 a. Calculating the mean: = = . + . + . + . + . + . + . + . i 18xi 1 53 1 50 1 37 1 51 1 55 1 42 1 41 1 48 = . x 11 778 = 1.47 The sample mean of the daily ammonia level in air in the tunnel is 1.47. b. Calculat ing the median: 1.37, 1.41, 1.42, 1.48, 1.50, 1.51, 1.53, 1.55 The middle 2 observat ions are 1.48 and 1.50. So m= (1.48+ 1.50)/2= 1.49 The sample median is an ammonia level of 1.49. c. The sample mean ammonia level was 1.47 and the sample median was 1.49....
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 Winter '08
 DrJoseCorrea
 Mean, Gobi Desert, sample median

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