Compute the mean and standard deviation CLASS INTERVAL | FREQUENCY 10—under 15 | 6 15—under 20 | 22 20—under 25 | 35 25—under 30 | 29 30—under 35 | 16 35—under 40 | 8 40—under 45 | 4 45—under 50 | 2
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- For the interval 10-under 15, the midpoint is (10 + 15) / 2 = 12.5 - For the interval 15-under 20, the midpoint is (15 + 20) / 2 = 17.5 - For the interval 20-under 25, the midpoint is (20 + 25) / 2 = 22.5 - For the interval 25-under 30, the midpoint is (25 + 30) Show more…
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