The amount of time workers spend commuting to their jobs each day in a large metropolitan city has a mean of 70 minutes and a standard deviation of 20 minutes. Assuming nothing is known about the shape of the distribution of commuting times, what percentage of these commuting times are between 30 and 110 minutes?
A) at least 0%
B) at least 75%
C) at least 89%
D) at least 95%

Question

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The Answer of The amount of time workers spend commuting to their jobs each day in a large metropolitan city has a mean of 70 minutes and a standard deviation of 20 minutes. Assuming nothing is known about the shape of the distribution of commuting times, what percentage of these commuting times are between 30 and 110 minutes?
A) at least 0%
B) at least 75%
C) at least 89%
D) at least 95%

The Amount of Time Workers Spend Commuting to Their Jobs