Question

a) Find the missing information from the following data mid exam results of Statistics course.          ...

a) Find the missing information from the following data mid exam results of Statistics course.

          b) Which group shows less variation among the marks?

Section 1

Section 2

Section 3

Combined values

Number of observations

n1=?

n2=25

n3=20

70

Standard deviation

σ1=4.5

σ2=?

σ3=5

5.2

Mean

x1¯¯¯¯¯=16

x2¯¯¯¯¯=14.5

x3¯¯¯¯¯=?

15.2

Math   Statistics-And-Probability   
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