6. There are 30 students in the group. The marks for the control test were the following 8 students received "excellent" marks, 12 students recieved "good" marks, 8 students "satisfactory" What is the probability that students invited for answer have "good" marks​

Step-by-step explanation:

The sampling is based on the 28 who received marks.  (Not the 30 in the group - 2 didn't submit a test).

Excellent         8        28.57%

Good        12   42.86%

Satisfactory8    28.57%

The proability for having a "Good" mark is 42.86%

answer: both chords and diameters have two endpoints on a circle. diameters must intersect the center of a circle.

1^3 + 2^3 + 3^3 +4^3 = (1+2+3+4)^2

step-by-step explanation:

i am only able to answer the first part. i am not sure about the second part. sorry