The ages of employees in a certain workplace are normally distributed. it is known that 80% of the workers are under 65 years old, and 67% are under 55 years old. what percentage of the workers are under 45 years old? (hint: first find  and σ by calculating the z-scores.) (b) suppose it is known that the wingspan x of the males of a certain bat species is normally distributed with some mean  and standard deviation σ, i. e., x n( , )   , while the wingspan y of the females is normally distributed with the same mean , but standard deviation twice that of the males, i. e., y n( , 2 )   . it is also known that 80% of the males have a wingspan less than a certain amount m. what percentage of the females have a wingspan less than this same amount m? (hint: calculate the z-scores.)