In a chess tournament involving 64 players, the ages of the contestants were sum

In a chess tournament involving 64 players, the ages of the contestants were summarized in a frequency table which gave the following information: • Ages between 15 and 24: 6 contestants • Ages between 25 and 34: 25 contestants • Ages between 35 and 44: 18 contestants • Ages between 45 and 54: 10 contestants • Ages between 55 and 64: 5 contestants Estimate the sample mean and sample standard deviation of the age of the contestants using formulas (2.A9) and (2.A11).

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