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S2 binomial distribution help, question

A completely unprepared student is given a true/false type test with 10 questions. Assuming that the student answers all the questions at random.
a) Find the probability that the student gets all the answers correct.

All I can get out of this question is;

X= number of correctly answered questions out of 10.

n= number of questions/10.

Should I be using the formula? And how do I find what the probability of actually answering a question correctly is, should I not be told that before attempting to know what the probability is for all 10 ?

Any help appreciated,

thanks.

Reply 1

Chewwy

so he gets the first right, the second right, the third right, ...