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 the distribution of commuting times is known to be moundshaped and symmetric, what percentage of these commuting times are between 50 and 110 minutes?
A) approximately 95%
B) approximately 68%
C) approximately 97.5%
D) approximately 81.5%

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 the distribution of commuting times is known to be moundshaped and symmetric, what percentage of these commuting times are between 50 and 110 minutes?
A) approximately 95%
B) approximately 68%
C) approximately 97.5%
D) approximately 81.5%

The Amount of Time Workers Spend Commuting to Their Jobs