Answer:
2.25
Step-by-step explanation:
The total frequency is:
20 + 12 + 6 + 2 = 40
Calculate the probability of each score:
P(X=3) = 20/40 = 0.50
P(X=2) = 12/40 = 0.30
P(X=1) = 6/40 = 0.15
P(X=0) = 2/40 = 0.05
So the expected value is:
E = (3)(0.50) + (2)(0.30) + (1)(0.15) + (0)(0.05)
E = 2.25
7/3 written as a mixed fraction is 2 1/3
So
7/3 = 2 1/3
Answer:
12 packages.
Step-by-step explanation:
Peaceful travel agency offers vacation packages.
Each vacation package include a city, a month and an airline.
The agency has 2 cities, 3 months and 2 airlines to choose from.
Agency can offer the number of different packages = 2 × 3 × 2
<span>So there
are 33 boys who tried out for track. And this is 27.5 % of the total boys. And there
15% of the girls who tried out for the track. And in total 22.5 % of the total
population tried out for track</span>
