Add 1/8 + 3/8 A. 3/64 B. 4/64 C. 4/16 D. 4/8

Mathematics

1 answer:

Alborosie3 years ago

3 0

Answer:

D. 4/8

Step-by-step explanation:

First you should have the same denominator. In this case you have it so you continue. And now you have to add the numerators together. So you get 4/8. You can also simplify it and divide the numerator and denominator by 4 and get 1/2

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$\frac{621}{2000}$ ≈ 0.31 = 31 %

set up equation

the probability of someone from the first group having brown eyes is $\frac{students-with-brown-eyes-in-first-group}{total-students-in-first-group }$

the probability of someone from the second group having brown eyes is $\frac{students-with-brown-eyes-in-second-group}{total-students-in-second-group }$

so the probability of both students having brown eyes is $\frac{students-with-brown-eyes-in-first-group}{total-students-in-first-group }$ * $\frac{students-with-brown-eyes-in-second-group}{total-students-in-second-group }$

values

students with brown eyes in first group = 27

total students in first group = 40

students with brown eyes in second group = 23

total students in second group = 50

plug in values and solve

$\frac{students-with-brown-eyes-in-first-group}{total-students-in-first-group }$ * $\frac{students-with-brown-eyes-in-second-group}{total-students-in-second-group }$

= $\frac{27}{40} *\frac{23}{50}$