Last time, one out of every 4 students in our class was absent. this time, after jen came back, only one out of every 5 students is absent. how many students are there in our class? how many students are not here today?

There are 20 students and 4 students are not here today.

Step-by-step explanation:

If the number of students = 4

Let the number of students be 'x'.

Fraction of students absent =

If the number of students = 5

Fraction of students absent =

And Jen came back,

So, the fraction of student absent is also written as

According to question, it becomes,

Hence, there are 20 students in our school.

And number of students are not here today is

15%

step-by-step explanation:

use the table and count the number of guesses that has two correct answers.

the following are two correct answers

10010, 01100, 11000

a total of 3 numbers having 2 correct guesses out of 20 questions.

probability of getting 2 correct guesses = the number of questions getting 2 correct answers / total number of questions.

= 3/20

to convert it into percent multiply by 100, we get

= 3/20 * 100

= 15%

the answer is 15%

you.