Is my answer in A and B correct?

Check my work The food services division of Cedar River Amusement Park Inc. is studying the amount of money spent per day on food and drink by families who visit the amusement park. A sample of 40 families who visited the park yesterday revealed they spent the following amounts: $77 41 60 $18 58 60 $63 58 45 $84 53 66 $38 51 83 $54 62 71 $50 43 63 $59 52 58 $54 53 61 $56 63 71 $36 62 $26 62 $50 65 $34 61 $44 52 Click here for the Excel Data File a. Organize the data into a frequency distribution, using seven classes and 15 as the lower limit of the first class. What class interval did you select? (Round up to the nearest whole number.) Class interval 101 b. Where do the data tend to cluster? (You may select more than one answer. Single click the box with the question mark to produce a check mark for a correct answer and double click the box with the question mark to empty the box for a wrong answer. Any boxes left with a question mark will be automatically graded as incorrect.) ? $25 up to $35 ? $45 up to $55 ? $35 up to $45 $55 up to $65 2 $75 up to $85