On a multiple choice test with 21 questions, each question has four possible answers, one of which is correct. for students who guess at all answers, find the standard deviation for the number of correct answers

Hello there, the answer is 5.25, or  5 1/4

Step-by-step explanation:

Since it has 21 questions, 4 choices each, we should divide 21÷4= 5.25

Inside of fraction form, the answer is 5 1/4

4th option is correct xy=-10

if this was to u plzz mark me the brainliest

understand that i don't know the answers

will someone answer his question