А A bag contains 10 marbles which can be described by
Colour and whether it is numbered or lettered as follows:
4 are white and Lettered, 2 are white and numbered, 3 are
yellow and lettered and 1 is
yellow and numbered. One marble
drawn from the bag and is found to be white .
what is the probability that it is numbered?​

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?