1

JEE Main 2022 (Online) 28th June Evening Shift

Numerical

+4

-1

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 fails in the examination if he/she gets less than 50 marks, then in worst case, the number of students can fail is _________.

Your input ____

2

JEE Main 2022 (Online) 28th June Morning Shift

Numerical

+4

-1

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 _____________.

Your input ____

3

JEE Main 2022 (Online) 25th June Evening Shift

Numerical

+4

-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 ______________.

Your input ____

4

JEE Main 2021 (Online) 1st September Evening Shift

Numerical

+4

-1

Let X be a random variable with distribution.

If the mean of X is 2.3 and variance of X is $$\sigma$$

x | $$ - $$2 | $$ - $$1 | 3 | 4 | 6 |
---|---|---|---|---|---|

P(X = x) | $${1 \over 5}$$ | a | $${1 \over 3}$$ | $${1 \over 5}$$ | b |

If the mean of X is 2.3 and variance of X is $$\sigma$$

^{2}, then 100 $$\sigma$$^{2}is equal to :Your input ____

Questions Asked from Statistics (Numerical)

Number in Brackets after Paper Indicates
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