cshopholic4921
16.12.2019 •
Mathematics
After many years of teaching, a statistics professor computed the variance of the marks on her final exam and found it to be σ2 = 250. she recently made changes to the way in which the final exam is marked and wondered whether this would result in a reduction in the variance. a random sample of this year’s final exam marks are listed here. can the professor infer at the 10% significance level that the variance has decreased?
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Ответ:
48, 54 and 60
Step-by-step explanation:
Let the three multiples be 6x, 6(x+1) and 6(x+2) respectively.
6x+6(x+1)+6(x+2)=162
6x+6x+6+6x+12=162
18x=144
x=8
Therefore, the three multiples are 6(8), 6(8+1) and 6(8+2)
i.e. 48, 54 and 60