Question: The following table shows the grouped data, in classes, for the heights of 50 people. 120

  2. The following table shows the grouped data, in classes, for the heights of 50 people.
    120 <- 130 2
    130 <- 140 5
    140 <- 150 25
    150 <- 160 10
    160 <- 170

    8
    a) Calculate the mean of the salaries of the 20 people. b) Calculate the standard deviation of the salaries of the 20 people.

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