Assume that the wavelengths of photosynthetically active radiations (PAR) are uniformly distributed at integer nanometers in the red spectrum from 625 to 640 nm. What is the mean and variance of the wavelength distribution for this radiation? Round your answers to one decimal place (e. g. 98.7).

Step-by-step explanation:

Let X the random variable that represent "The wavelengths of photosynthetically active radiations PAR ". And we know that the distribution of X is given by:

The density function is given by:

And for other case.

The mean for this case is given by:

And if we replace we got:

For the variance of the random variable X we can use the following formula:

So then the answer would be:

$4

step-by-step explanation:

$30×5=$150

$150 minus $130=$20

$20÷5=$4.

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