Sardarel A researcher was curious to find the average mileage per year. The bable gives the distribution of distances (in thousands of Km) driven during the past year by random sample of. n = 40 1) Find the mean mileage (2 decimals ) Mileage per year Mileage Number of ( x ) drivers ( ( ) B ) Find the sample variance of mileage per year. 0 - 10 ( 2 decimals ) 10- 20 20- 30 Find the sample standard deviation 30 - 40 of the mileage per year. 40- 50 2 decimals