Aprofessor has recorded exam grades for 20 students in his class, but one of the grades is no longer readable. if the mean score on the exam was 81 and the mean of the 19 readable scores is 85, what is the value of the unreadable score?

The value of the unreadable score is

It should be noted that the mean of numbers simply means the average of the numbers.

Since the mean score of the 20 students was 81, then the total score will be:

Then, since the mean score of the 19 students was 85, their total scores will be: =

The value of the unreadable score will be:

.

Read related link on:

link

answer:

step-by-step explanation:

here, the total dishes = 10

dishes having meat = 3 ( chicken, meatloaf and hamburger )

thus, the probability of having meat on the chosen dishes = number of dishes having meat / total dishes

=

therefore, the probability of not having meat = 1- the probability of having meat on the chosen dishes

=

=

=

⇒ option b is correct.

other answer is correct. i had used the radius of the radius somehow. a website: