1

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 ____

2

JEE Main 2021 (Online) 31st August Morning Shift

Numerical

+4

-1

An electric instrument consists of two units. Each unit must function independently for the instrument to operate. The probability that the first unit functions is 0.9 and that of the second unit is 0.8. The instrument is switched on and it fails to operate. If the probability that only the first unit failed and second unit is functioning is p, then 98 p is equal to _____________.

Your input ____

3

JEE Main 2021 (Online) 27th August Evening Shift

Numerical

+4

-1

The probability distribution of random variable X is given by :

Let p = P(1 < X < 4 | X < 3). If 5p = $$\lambda$$K, then $$\lambda$$ equal to ___________.

X | 1 | 2 | 3 | 4 | 5 |
---|---|---|---|---|---|

P(X) | K | 2K | 2K | 3K | K |

Let p = P(1 < X < 4 | X < 3). If 5p = $$\lambda$$K, then $$\lambda$$ equal to ___________.

Your input ____

4

JEE Main 2021 (Online) 25th July Evening Shift

Numerical

+4

-1

A fair coin is tossed n-times such that the probability of getting at least one head is at least 0.9. Then the minimum value of n is ______________.

Your input ____

Questions Asked from Probability (Numerical)

Number in Brackets after Paper Indicates No. of Questions

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