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Calculate the Mean and Standard Deviation for the Results Below

Question 21

Multiple Choice

Calculate the mean and standard deviation for the results below for the concentration of lead in a soil sample. 23.2 ppm,20.1 ppm,24.7 ppm,19.9 ppm,21.8 ppm


A) 21.9 3.4 (n = 5) ppm
B) 21.9 2.0 (n =5) ppm
C) 27.4 2.0 (n = 5) ppm
D) 22.0 1.8 (n = 5) ppm
E) 27.4 4.2 (n = 5) ppm

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