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:

81 seats

step-by-step explanation:

if you multiply 0.65 times 125 then you get 81.5 seats. well since you can't have half of a seat you have to round down and get 81 seats in the no children zones. that leave 44 seats outside of the no children zone.