JEE Main 2022 (Online) 28th June Morning Shift | Statistics Question 46 | Mathematics

The mean and standard deviation of 15 observations are found to be 8 and 3 respectively. On rechecking it was found that, in the observations, 20 was misread as 5. Then, the correct variance is equal to _____________.

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JEE Main 2022 (Online) 25th June Evening Shift

Numerical

-1

If the mean deviation about the mean of the numbers 1, 2, 3, .........., n, where n is odd, is $${{5(n + 1)} \over n}$$, then n is equal to ______________.

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JEE Main 2021 (Online) 31st August Morning Shift

Numerical

-1

The mean of 10 numbers 7 $$\times$$ 8, 10 $$\times$$ 10, 13 $$\times$$ 12, 16 $$\times$$ 14, ....... is ____________.

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JEE Main 2021 (Online) 27th August Evening Shift

Numerical

-1

An online exam is attempted by 50 candidates out of which 20 are boys. The average marks obtained by boys is 12 with a variance 2. The variance of marks obtained by 30 girls is also 2. The average marks of all 50 candidates is 15. If $$\mu$$ is the average marks of girls and $$\sigma$$² is the variance of marks of 50 candidates, then $$\mu$$ + $$\sigma$$² is equal to ________________.

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