An agency collects demographics concerning the number of people in families per household in a certain country. Assume the distribution of the number of people per household is as shown in the table to the right.
x P(x) 2 0.27 3 0.26 4 0.27 5 0.13 6 0.03 7 0.04 |
x | P(x) | x*P(x) | x^2*P(x) |
2 | 0.27 | 0.54 | 1.08 |
3 | 0.26 | 0.78 | 2.34 |
4 | 0.27 | 1.08 | 4.32 |
5 | 0.13 | 0.65 | 3.25 |
6 | 0.03 | 0.18 | 1.08 |
7 | 0.04 | 0.28 | 1.96 |
sum | 1 | 3.51 | 14.03 |
Ansa:
expected number of people in families per household in the country is E(x)
E(x)==3.51
# expected number=3.51
Ansb:
standard deviation =sd
# standard deviation=1.3076
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