The following data shows the marks of 40
Students in a Chemistry examination.
41.52 37 56 63 48 65. 46 54 32 51
66 74 25 35 61 58 44 49 53 45 57 5
38 59 28 50 49 67 56 36 45 79 68 4
56 26 47 55 71
form a grouped frequency table with the
Class interval 20-29, 30-39, etc..
using an assumed mean method, find the mean