B. Undercoverage? Because the survey was only given to a certain group of people
Answer:
the bottom one b and c
Step-by-step explanation:
it goes at a steady rate of 2b=c
Answer:
true, unless its a check all that apply and then you can have multiple!
Step-by-step explanation:
hope this helps :)
Answer:
Pr (at least 1 blue ball) = 4/7
Step-by-step explanation:
Number of blue balls= 4
Number of red balls= 3
Total number of balls = 3+4 = 7
This is a case of probability without replacement since the ball taken at random isn't replaced.
Pr (blue ball) = 4/7
Pr (red ball) = 3/7
Where Pr means probability
Pr (at least 1 blue ball) = Pr (1 blue ball and 1 red ball) + Pr (2 blue balls)
In probability without replacement, after picking the first ball, only the total number of balls would change if the colours are different. It would reduce by 1.
But If the balls are the same, the total number of balls would reduce by 1 and the total number of same ball would also reduce by 1
Pr (1 blue ball and 1 red ball) = (4/7 × 3/6)
Pr (2 blue ball) = (4/7 × 3/6)
Pr (at least 1 blue ball) = (4/7 × 3/6) + (4/7 × 3/6)
Pr (at least 1 blue ball) = 12/42 + 12/42
Pr (at least 1 blue ball) = 24/42 = 4/7
Pr (at least 1 blue ball) = 4/7
