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Question 1:
The calculation of the z-scores and the corresponding table:
    Beers per week
    Deviation
    Z-score
    2
    -5
    -3.33333
    4
    -3
    -2
    7
    0
    0
    11
    4
    2.666667
    12
    5
    3.333333
    16
    9
    6
Question 2:
    Greater than the z-scores
    Proportions
    1.5
    0.5
    2.86
    0.333333333
    0.43
    0.5
    -1.11
    0.666666667
    0
    0.5
Question 3:
    Less than the z-scores
    Proportions
    -1.5
    0.333333333
    1.5
    0.5
    -3.33
    0.166666667
    0.62
    0.5
    0
    0.333333333
Question 4:
    greater than Z = 2.6 and less than Z = -2.6
    0.666666667
    greater than Z = 1.96 and less than Z = -2.6
    0.666666667
    greater than Z = 1 and less than Z = -1.5
    0.833333333
Question 5:
    between Z = 1.96 and Z = -1.96
    0.166666667
    between...