Let 𝑋 be a random variable exponentially distributed with parameter 𝜆 > 0.…

Let 𝑋 be a random variable exponentially distributed with parameter 𝜆 > 0. The probability density function of X is given by:

$f_X(x) = \begin{cases} \lambda e^{-\lambda x}, & \text{if } x \geq 0 \\ 0, & \text{otherwise} \end{cases}$

If 5𝐸(𝑋) = 𝑉𝑎𝑟(𝑋), where 𝐸(𝑋) and 𝑉𝑎𝑟(𝑋) indicate the expectation and variance of 𝑋, respectively, the value of 𝜆 is ______ (rounded off to one decimal place).