25 students in class a did a science exam.
30 students in class b did the same science exam.
the mean mark for the 25 students in class a is 67.8
the mean mark for all the 55 students is 72.0.
work out the mean mark for the students in class
b.

Gray looks up the definition of point. a point is a location in a region. what is true about the statement describing the word point? 1. the statement uses the terms location and region that are defined based on an understanding of a point. 2.the statement precisely defines the concept of a point. 3. the statement does not include information needed to fully define a point. 4. the statement is an incorrect description of a point because it does not use mathematical words.