The table below gives the ages and systolic blood pressure (measured in millimeters of mercury) of 9 randomly selected adults.
Subject # 1 2 3 4 5 6 7 8 9
Age, x 41 44 48 51 54 56 60 64 68
Pressure, y 111 115 118 126 137 140 143 145 147
Part 1: Calculate the mean age of the 9 randomly selected adults. Show the formula that you will use and then calculate the mean age.
Answer: Formula: mean =
Mean:
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To calculate the mean age of the 9 randomly selected adults, you need to use the formula:
mean = sum of all individual ages / total number of individuals
Let's calculate the mean age:
Age, x: 41, 44, 48, 51, 54, 56, 60, 64, 68
Sum of all individual ages = 41 + 44 + 48 + 51 + 54 + 56 + 60 + 64 + 68 = 486
Total number of individuals = 9
mean = 486 / 9
mean = 54
Therefore, the mean age of the 9 randomly selected adults is 54.