18. Records from a dairy farm yielded the following information on the number of male and female calves born
at various times of the day.
What is the probability that a randomly selected calf was born in the night or was a female?
a.
369
513
b.
485
513
c.
116
513
d.
116
252
e.
116
233

The ages of personnel in the accounting department of a large company are normally distributed with a standard deviation of 7 years. there is a 0.02275 probability that the age of any randomly chosen person in the department is less than 22 and 0.15866 probabilty that the age of any randomly chosen person is greater than 43. what is the mean of this distribution?