MathsJEE Main 28 Jan 2026, Shift 2·Q4·MCQ·Easy–moderate

Probability · Expectation of a random variable

The probability distribution of a random variable

X

is given below :

$X$	$4k$	$\dfrac{30}{7}k$	$\dfrac{32}{7}k$	$\dfrac{34}{7}k$	$\dfrac{36}{7}k$	$\dfrac{38}{7}k$	$\dfrac{40}{7}k$	$6k$
$P(X)$	$\dfrac{2}{15}$	$\dfrac{1}{15}$	$\dfrac{2}{15}$	$\dfrac{1}{5}$	$\dfrac{1}{15}$	$\dfrac{2}{15}$	$\dfrac{1}{5}$	$\dfrac{1}{15}$

E(X) = \dfrac{263}{15}

, then

P(X < 20)

is equal to :

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