a 50% d 20% a 10 cm Show the following percentages on a drawing b 25% c 75% e 40% f 80% There are 100 cm in one metre. What percentage of 1 m is: b 11 cm c 27 cm d 51 cm e 73 cm f 99 cm? There are 10 mm in one centimetre. What percentage of 1 cm is: à 1 mm b 2 mm C4 mm e 7 mm f 9mm

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?