matthewlucas8613
02.09.2021 •
Mathematics
Tammy scored 88, 72, 44 points on her first three test. What must she score in her last test to get at least an average of 70?
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Ответ:
76
Step-by-step explanation:
(88+72+44+x)/4=70
88+72+44+x=280
204+x=280
x=76
Therefore, Tammy needs to score a 76 on her last test to get at least an average of 70.
Ответ:
This is the resultant combinations:
b b b b
b b b g
b b g b
b b g g
b g b b
b g b g
b g g b
b g g g
g b b b
g b b g
g b g b
g b g g
g g b b
g g b g
g g g b
g g g g
If you count all the possibilities they are 16. Which is the same as 2^4 = 2*2*2*2, so I know that I didn't miss a combination.
The possibility of having no boys is one (g g g g combination) in 16, so the probability is 1 / 16 = 0,0625.