1] To calculate the number of grade in which most students plan to have careers in stem we proceed as follows:
Number of students in:
6th grade who want career in stem is:
1/4 x 152=38
7th grade who want career in stem is:
3/10x160=48
8th grade who want career in step is:
2/7 x 147=42
From above we conclude that the majority of students who want a career in stem are in 7th grade
2] Given that 3/4 students in 6th grade want a career in teaching or stems, the fraction of students who do not want career in teaching or stem is:
1-3/4
=1/4
thus the number of these students who do not want the mentioned career will be:
1/4 x 152=38