A student takes an exam containing 18 true or false questions, if the students guesses, what is the probability that he will get less than 10 but more than 7 questions right

0.3523 is the probability that the student will get less than 10 but more than 7 questions right.      

Step-by-step explanation:

We are given the following information:

We treat answering the question correctly as a success.

P(guess of answer is correct) = 50% = 0.5

Then the number of questions follows a binomial distribution, where

where n is the total number of observations, x is the number of success, p is the probability of success.

Now, we are given n = 18

We have to evaluate:

0.3523 is the probability that the student will get less than 10 but more than 7 questions right.

e^-kt = n/n0 = 0.79  

-kt = ln 0.79  

t = - ln 0.79/0.0001  

= 2357 years

step-by-step explanation:

c

step-by-step explanation: