The letters a, b, c, d, e, and f are written on six different ping pong balls and put into a bag. the letters h, i, j, and k are written on another four different ping pong balls and put into a second bag. then the letters o, p, q, r, s, t, and u are written on another seven different ping pong balls and put into a third bag. if one ping pong ball is randomly selected from each of the three bags, what is the probability that at least one vowel (a, e, i, o, u) is selected?

Use the given degree of confidence and sample data to construct a confidence interval for the population mean mu . assume that the population has a normal distribution. a laboratory tested twelve chicken eggs and found that the mean amount of cholesterol was 185 milligrams with sequals 17.6 milligrams. a confidence interval of 173.8 mgless than muless than 196.2 mg is constructed for the true mean cholesterol content of all such eggs. it was assumed that the population has a normal distribution. what confidence level does this interval represent?