The following table gives the distribution of the ages of a sample of 50 managers. Age range Frequency fifi 20≤age<25 7 25≤age<30 15 30≤age<50 23 50≤age<60 5     Sketch a histogram for this data, and calculate the mean x¯ and sample standard deviation s. Enter your answers in square brackets, separated by commas, and round to 2 decimal places when necessary.  Calculate the median x~, and interquartile range IQR. Enter your answers in square brackets, separated by commas and round to 2 decimal places What proportion of managers (as a percentage, rounded to 2 decimal places) are over 40 years of age?

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