The table shows the results of randomly selecting colored marbles from a bag 40 times. The marble was returned to the bag after
each selection.
Based on these results, what is the expected probability of randomly selecting a green marble from the bag in one attempt?
A. 0.125
B. 0.20
C. 0.80
D. 1.0
(show your work please)
Based on these results, what is the expected probability of randomly selecting a green marble from the bag in one attempt?
A. 0.125
B. 0.20
C. 0.80
D. 1.0
(show your work please)
1 answer:
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Answer:
Step-by-step explanation:
Question One
Multiply through by 2
2*1/2 * (2x + y ) = 21/2 * 2
Combine
2x + y = 21
Subtract 2x from both sides
y = 21 - 2x
Now equate the two given equations
y = 21 - 2x
y = 2x
Add 2x to both sides
2x = 21 - 2x
2x + 2x = 21
4x = 21
x = 21/4
x = 5 1/4
or
x = 5.25
Question 2
multiply numerator and denominator of the second fraction by (x + 2)
Remove the numerator brackets in the right hand fraction. Look out for the minus sign.