(ix) What is the median of 7, 10, 7,5,9,10 ?(A) 7 (B) 9 (C) 8 (D) 10(x) From following table, what is the cumulative frequency of less than type for theclass 30-40 ?Class 0-10 10-20 20-30 30-40 40-50Frequency 7312132(A) 13 (B) 15 (C) 35 (D) 22(2) The mean salary of 20 workers is Rs.10,250. If the salary of office superintendent isadded, the mean will increase by Rs.750. Find the salary of the office superintendent.(3) The mean of nine numbers is 77. If one more number is added to it then the meanincreases by 5. Find the number added in the data.(4) The monthly maximum temperature of a city is given in degree celcius in the followdata. By taking suitable classes, prepare the grouped frequency distribution table29.2, 29.0, 28.1, 28.5, 32.9, 29.2, 34.2, 36.8, 32.0, 31.0,30.5, 30.0, 33, 32.5, 35.5, 34.0, 32.9, 31.5, 30.3, 31.4,30.3, 34.7, 35.0, 32.5, 33.5, 29.0, 29.5, 29.9, 33.2, 30.2​