The amount spent per month by employees for parking at a municipal lot is normally distributed with a mean of $540 and a standard deviation of $95. (Round the final answers to 2 decimal places.) a. About what percentage of the observations lie between $445 and $635? Percentage of observations % b. About what percentage of the observations lie between $350 and $730? Percentage of observations. % c. About what percentage of the observations lie between $255 and $825? Percentage of observations %