The following grouped frequency table shows information about students' marks in a test. The test was out of 30.
To pass the test a student needs to get over half of the marks.

Test scoreFrequency
0 - 54
6 - 106
11 - 156
16 - 206
21 - 256
26 - 302

What fraction of students passed the test?

Okay so for every triangle has three angles that always add up to 180 degrees. and to tell the difference between whether they are secure, right or obtuse is that acute: has one angle that is less than 90 degrees. right triangle means there is at least one angle that is exactly 90 degrees. and an obtuse angle has an angle that is bigger than 180 degrees. i’ll do #13 as an example: 13. 40 and 50 so if every triangle has 180 degrees 40+50= 90 degrees then180-90= 90 degrees so the third angle is 90 degrees and because this triangle has a 90 degree angle it means it is a right triangle

Idon’t know how to do that