I need help finding the missing lengths
2 answers:
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Answer:
48
Step-by-step explanation:
The square pyramid has exactly the same four triangles.
In order to find the whole surface area, we must find the area of one of the triangles and multiply them by 4.
Surface area of square pyramid =
Where we know that b = 4 and h = 6.
Substituting into the formula should give us the answer 48.
Answer:
The answer is c) 761.0
Step-by-step explanation:
Mathematical hope (also known as hope, expected value, population means or simply means) expresses the average value of a random phenomenon and is denoted as E (x). Hope is the sum of the product of the probability of each event by the value of that event. It is then defined as shown in the image, Where x is the value of the event, P the probability of its occurrence, "i" the period in which said event occurs and N the total number of periods or observations.
The variance of a random variable provides an idea of the dispersion of the random variable with respect to its hope. It is then defined as shown in the image.
Then you first calculate E [x] and E [], and then be able to calculate the variance.
E[X]=88
So <em>E[X]²=88²=7744</em>
On the other hand
E[x²]=0+5+250+8250
<em>E[x²]=8505 </em>
Then the variance will be:
Var[x]=8505-7744
<u><em>Var[x]=761 </em></u>
