The marks of ag soup of student in a college are below
65 70 60 48 51 05 59 63 68 53
45 53 72 53 67 62 64 70 57 56 73 56 48 51 58 63 65 62 49 64 53 59 63 50 48 72 67 56 61 64 66 52 49 62 71 58 53 69 63 59

Prepare a grouped frequency with class interval 45-49,50-54,55-59 etc.

Using an assumed mean or 62 or other wise calculate the mean and the standard derivation of the grouped data correct to one decimal place.