Question 1 :
<img style='object-fit:contain' src='61b19a96273b23058497993a' /> To find out the concentration of $SO_2$ in the air (in parts per million, i.e. ppm), the data was collected for 30 localities in a certain city and is presented above. Find the mean concentration of $SO_2$ in the air.

Question 2 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b19bfb273b230584979a52.PNG' /> The distribution above shows the number of wickets taken by bowlers in one-day cricket matches. Find the mean number of wickets.

Question 3 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b19bfc273b230584979a54.PNG' /> The marks obtained by 30 students of Class X of a certain school in a Mathematics paper consisting of 100 marks are presented in table above. Find the mean of the marks obtained by the students

Question 4 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b19bfd273b230584979a55.PNG' /> The table above gives the percentage distribution of female teachers in the primary schools of rural areas of various states and union territories (U.T.) of India. Find the mean percentage of female teachers.

Question 5 :
<img style='object-fit:contain' src='61b19aa7273b23058497993c' /> The above table gives the literacy rate (in percentage) of 35 cities. Find the mean literacy rate.

Question 6 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b19c14273b230584979a70.PNG' /> 100 surnames were randomly picked up from a local telephone directory and the frequency distribution of the number of letters in the English alphabets in the surnames was obtained as given above. Determine the mean number of letters in the surnames.

Question 7 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b19c09273b230584979a63.PNG' /> The above distribution shows the daily pocket allowance of children of a locality. The mean pocket allowance is Rs 18. Find the missing frequency $f$.

Question 8 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b19c0b273b230584979a65.PNG' /> A class teacher has the following absentee record of 40 students of a class for the whole term. Find the mean number of days a student was absent.

Question 9 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b19c11273b230584979a6c.PNG' /> The above data gives the distribution of total monthly household expenditure of 200 families of a village. Find the mean monthly expenditure.

Question 10 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b19c14273b230584979a6f.PNG' /> The above given frequency distribution gives the monthly consumption of electricity of 68 consumers of a locality. Find the mean.