Question

The mean marks of 5 students is
23.1f the marks scored are 20,21,23,18
and x, then xis

0.20
23
28
33​

Answer 1

Step-by-step explanation:

fi is given ( 20, 21, 23, 18 and x)

find xi (xi is the mid point of class intervals of each class)

add all the fi terms = 82x

multiple each fi with their corresponding xi

add all the fixi

divide fixi by fi → (23 = fixi/fi)

answer will come

you didnt wrote class intervals so this is all i can do to help

Answer 2

Answer:

the value of the x will be 33

Step-by-step explanation:

it is the problem from the field of mean calculation of the statistical problem.

the general formula of mean is

the grand total of the marks divided by the total number of students

$mean=\frac{total \ marks}{total \ students}$

here,

the grand total is

$20+21+23+18+x\\82+x$

mean = 23

total student = 5

total marks = 82+x

putting the corresponding values we obtain

$23=\frac{82+x}{5}$

now, we apply simple operations to solve this equation step by step

multiply both side by 5 we get

$115=82+x$

now, subtract 82 from both side we get

$x=33$

So the value of x is 33 and the last option is correct.