Find the standard deviation for the following samples 1. The following is the frequency distribution of the weights of 50 patients admitted in a hospital during the week. Weight (kg) 46-50 51-55 56-60 61-65 66-70 71-75 Number of Patients 4 6 10 14 9 7 2. Given the time distribution of 50 college students for their weekly part-time work in a university. Hours 1-4 Number of Students 2 5-8 4 9-12 6 13-16 10 17-20 12 21-24 16.