:work out an estimate to these calculations

1) 4.34×2.8 / 2

2) 91.2-72.4 / 17

3) 99.83×4.7 / 9

Answer this question! 30 points and brainliest! only if you know the answer.

Lems1. the following data set represents the scores on intelligence quotient(iq) examinations of 40 sixth-grade students at a particular school: 114, 122, 103, 118, 99, 105, 134, 125, 117, 106, 109, 104, 111, 127,133, 111, 117, 103, 120, 98, 100, 130, 141, 119, 128, 106, 109, 115,113, 121, 100, 130, 125, 117, 119, 113, 104, 108, 110, 102(a) present this data set in a frequency histogram.(b) which class interval contains the greatest number of data values? (c) is there a roughly equal number of data in each class interval? (d) does the histogram appear to be approximately symmetric? if so, about which interval is it approximately symmetric?

What are the coordinates of the midpoint of ab? ,1/2) /2,-1) ,-3/2) /2,-2)