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Data are drawn from a bell-shaped distribution with a mean of 120 and a standard deviation...

Data are drawn from a bell-shaped distribution with a mean of 120 and a standard deviation of 3.
a.

Approximately what percentage of the observations fall between 111 and 129? (Round your answer to the nearest whole percent.)
  Percentage of observations %   
b.

Approximately what percentage of the observations fall between 114 and 126? (Round your answer to the nearest whole percent.)
Percentage of observations %   


c.

Approximately what percentage of the observations are less than 114? (Round your answer to 1 decimal place.)
Percentage of observations %   
Math   Statistics-And-Probability   
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