The probability that Nins goes 0 days is 0.2, the probability that she goes 1 day is 0.50, and the probability that she goes 2 days is 0.30. You can write these data as a table:
[tex] \begin{array}{cccc}
x_i & 0 & 1 & 2 \\
p_i & 0.2 & 0.5 & 0.3
\end{array} [/tex]
where [tex] x_i [/tex] are numbers of days and [tex] p_i [/tex] are probabilities.
The expected value of the number of days per week on which Nina goes to the supermarket is
[tex] E(X)=\sum\limits_{i=1}^3x_ip_i=0\cdot 0.2+1\cdot 0.5+2\cdot 0.3=0.5+0.6=1.1 [/tex].
Answer: the expected value of the number of days per week on which Nina goes to the supermarket is 1.1.
Answer:
1.1
Step-by-step explanation:
I got it right on the Edmentum Test
