Answer:8
Step-by-step explanation:
We have given test consists of 40 multiple choice questions having five options for each question.
Suppose there is one correct answer to each question
therefore probabilty of getting a correct answer on making a guess is
i.e. 1 out of 5 questions is correct
Using binomial distribution
where n=40 p=
mean of binomial distribution is np
therefore mean of no of correct answers=
=8
Answer:
9%
Step-by-step explanation:
Probability of the first person being selected is 4/12 and the probability of the second person being selected is 3/11
The probability of both is:
4/12 x 3/11
= 1/11 which is 9%
No. You can only add variables that have the same exponents. Also, during addition of variables with the exponent, you do not add the exponents.