Answer:
C
Step-by-step explanation:
Given y ∝ then the equation relating them is
y = ← k is the constant of variation
To find k use the condition y = - 2 when x = 14 , then
- 2 = ( multiply both sides by 14 )
- 28 = k
y = - ← equation of variation
You can solve using the quadratic formula and the zeros it produces will be the solutions.
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:
where are numbers of days and are probabilities.
The expected value of the number of days per week on which Nina goes to the supermarket is
.
Answer: the expected value of the number of days per week on which Nina goes to the supermarket is 1.1.