I’m not sure but I think 4 classes have between 27 and 31 students
Range= max number-min number so the highest number is 9 and the lowest number is 0. 9-0=9 so your range or spread of data would be 9
The answer is B
100% use photomath
And sub to pewdiepie
Answer: 680
Step-by-step explanation:
When order doesn't matter,then the number of combinations of choosing r things out of n = 
Given: Total participants = 17
From these, a group of 3 participants is to be tested under a special condition.
Number of groups of 3 participants chosen = 

Hence, there are 680 groups of 3 participants can be chosen,.