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warnene17
07.10.2019 •
Mathematics
In testing a certain kind of missile, target accuracy is measured by the average distance x at which the missile explodes. the distance x is measured in miles and the sampling distribution of x is given by:
x 0 10 50 100
p(x) 1/40 1? 20 1/10 33/40
calculate the variance of this sampling distribution.
options:
a) 27.6
b) 5138.7
c) 761.0
d) 253.7
e) 88.0
f) none of the above
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Ответ:
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 E[X]²=88²=7744
On the other hand
E[x²]=0+5+250+8250
E[x²]=8505
Then the variance will be:
Var[x]=8505-7744
Var[x]=761
Ответ:
$41
Step-by-step explanation: Hope this help