The amount spent per month by employees for parking at a municipal lot is normally distributed with a mean of 5380 and a standard deviation of $55. (Round the finol onswers to 2 decimal places.) o. About what percentage of the observations lle between $325 and $435 ? Percentage of observations b. About what percentage of the observations lie between $270 and $490 ? Percentage of observations c. About what percentage of the observations lie between $215 and $545 ? Percentage of obstrvations