I need help thes quston. pleas help. show work not to much is apprecite if possible, thanks

points) The frequency distribution table of the students' grades in the Algebra course of randomly selected 20 students from 2000 students in a local college. This is the sample data. Find the mean and standard deviation. Grade c Total frequency 10 5 4 20 Find the mean and standard deviation. Use Grade point system points) The table below shows the daily lunch sales of 42 customers under Pandemic. This is the population data. Sales per week $0 -$10 $10 -$20 $20 - $30 $30 - $40 Total Frequency 10 20 8 4 42