The percentage of banana yields that are less than 47 bananas is 0.15%.
The empirical rule states that for a normal distribution, 68% of the values are within one standard deviation from the mean, 95% of the values are within two standard deviation from the mean and 99.7% of the values are within three standard deviation from the mean
Given mean of 62 and standard deviation of 5, hence:
99.7% are within 3 standard deviation = 62 ± 3(5) = (47, 77)
The percentage less than 47 bananas = (100% - 99.7%) / 2 = 0.15%
The percentage of banana yields that are less than 47 bananas is 0.15%.
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