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Q JEE MAIN 2021
JEE Main Mathematics Medium
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Q JEE MAIN 2021
-If the mean and variance of six observations $7,10,11,15, a, b$ are 10 and $\frac{20}{3}$, respectively, then the value of $|a-b|$ is equal to :
JEE Main Mathematics Easy
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Q JEE MAIN 2021
If the variance of 10 natural numbers 1, 1, 1,...., 1, k is less than 10, then the maximum possible value of k is
JEE Main Mathematics Medium
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Q JEE MAIN 2021
The mean age of 25 teachers in a school is 40 years. A teacher retires at the age of 60 years and a new teacher...
JEE Main Mathematics Easy
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Q JEE MAIN 2021
Consider three observations a, b and c such that b = a + c. If the standard deviation of a + 2, b + 2,...
JEE Main Mathematics Easy
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Q JEE MAIN 2022
The mean and variance of the data $4,5,6,6,7,8, x, y$ where $x
JEE Main Mathematics Easy
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Q JEE MAIN 2022
Suppose a class has 7 students. The average marks of these students in the mathematics examination is 62, and their variance is 20. A student...
JEE Main Mathematics Hard
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Q JEE MAIN 2022
The number of values of $a \in \mathbb{N}$ such that the variance of $3,7,12 a, 43-a$ is a natural number is:
JEE Main Mathematics Easy
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Q JEE MAIN 2022
The mean and standard deviation of 50 observations are 15 and 2 respectively. It was found that one incorrect observation was taken such that the...
JEE Main Mathematics Medium
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Q JEE MAIN 2022
If the mean deviation about the mean of the numbers $1,2,3$, $\_\_\_\_$ $n$, where $n$ is odd, is $\frac{5(n+1)}{n}$, then $n$ is equal to $\_\_\_\_$
JEE Main Mathematics Easy
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