The grade point averages (GPA) for 12 randomly selected college students are shown on the right. Complete parts (a) through (c) below. 2.1 3.1 2.7 1.7 0.9 4.0 2.1 1.2 3.6 0.4 2.5 3.1 Assume the population is normally distributed. (a) Find the sample mean. x = 2.28 (Round to two decimal places as needed.) (b) Find the sample standard deviation. s = (Round to two decimal places as needed.)
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To do this, we add up all the values and divide by the number of values (12 in this case). Mean (x̄) = (2.7 + 5 + 4.0 + 3.6 + 3.1 + 1.7 + 0.9 + 1.2 + 2.5 + 0.4)/12 Mean (x̄) = 25.1/12 Mean (x̄) = 2.09166666667 Now, we need to find the sample standard Show more…
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