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Aleks [24]
3 years ago
6

Help! 20 Points! + Brainliest! Which expressions have been simplified correctly? Choose exactly two answers that are correct.

Mathematics
1 answer:
marishachu [46]3 years ago
5 0

\huge\underline\mathtt\colorbox{gold}{B}

{z^-2=1/z^2}

<h2>AND </h2>

\huge\underline\mathtt\colorbox{silver}{D}

{(ab)^0=1}

<h2>Are both correct</h2>
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Assume that the wavelengths of photosynthetically active radiations (PAR) are uniformly distributed at integer nanometers in the
trasher [3.6K]

Answer:

Mean=685

Variance=36.7

Step-by-step explanation:

The mean of uniform discrete distribution can be expressed as the average of the boundaries

mean=( b+a)/2

The variance of uniform discrete distribution can be expressed as the difference of the boundaries decreased by 1 and squared, decreased by 1 and divided by 12.

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We were given the wavelength from from 675 to 695 nm which means

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We can now calculate the mean by using the expresion below

mean=( b+a)/2

Mean=( 675 + 695)/2

=685

The variance can be calculated by using the expression below

σ²=[(b-a+1)^2 - 1]/12

σ²=[(695-675+1)^2 -1]/12

σ²=440/12

σ²=36.7

Therefore, the the mean and variance, of the wavelength distribution for this radiation are 685 and 36.7 respectively

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3 years ago
Is there a way for me to know that 31.1126983722080911 equals 22√2 without plugging in multiple choice answers? Like how do I co
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