ILL MARK U BRAINLIEST IF U EXPLAIN!! There are twenty one 8th graders, seventeen 7th graders and twelve 6th graders. What is the probability of NOT randomly selecting a 7th grader if you went into the library?

66%
50%
42%
24%

Aright triangle includes one angle that measures 30º. what is the measure of the third angle? a. 30º b. 90º c. 60º d. 130º

What is the geometric mean of 3 and 7? a) square root of 21 b) 2 square root of 6 c) 2 square root of 7 d) 21

Aresearch study is done to find the average age of all u.s. factory workers. the researchers asked every factory worker in ohio what their birth year is. this research is an example of a census survey convenience sample simple random sample