Each student in a class of 25 students wrote down a random digit. what is the predicted number of students who will win a digit that is greater than 7?

Comment
I'm going to assume that 0 is below 1 and not above 9. Furthermore that there are 10 digits altogether.

Argument
I may not understand the problem, but I think it means that how many students will randomly choose an 8 or 9.

Since both can come up (randomly) 1/10 of the time, it would seem to me that the answer should be

1/10 * 25 + 1/10 * 25 = 5 

so 5/25 students will come up with an 8 or 9.
so P(8 or 9) = 0.2 <<<< answer

Note
Any two digits should give you the same result.

Answer d; a supplementary angle = 180°, so if that angle = 150°, y would = 30°.