The marks of 5 students in a unit test are given below:
\(x-1,\ 2x+1,\ 2x-2,\ x-1,\ 2x+3\) where \(x=5\).
On the basis of the above information, answer the questions.
The mean of the data in numerals is
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → 8
First put \(x=5\) into each expression to get the five marks; the mean is their sum divided by the number of students.
Marks: \(5-1=4\), \(2(5)+1=11\), \(2(5)-2=8\), \(5-1=4\), \(2(5)+3=13\)
Sum: \(4+11+8+4+13=40\)
Mean \(\displaystyle =\frac{40}{5}=8\)