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Tom [10]
3 years ago
13

Simplify 9/20 × 4/5

Mathematics
1 answer:
Cerrena [4.2K]3 years ago
3 0
<span>Answer:  18/25 ; or, write as:  0.72  .
_____________________________________
Explanation:
<span>_____________________________________
</span>
9/20  * 4/5  = (</span>9*4) / (10*5) = 36/50 ; 
<span>_____________________________________________________

36/50 = </span>(36÷2) / (50÷2) = 18/25 ; or, write as:  0.72  .
<span>_____________________________________________________
</span>
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A Martian couple has children until they have 2 males (sexes of children are independent). Compute the expected number of childr
Ne4ueva [31]

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a) 6

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Step-by-step explanation:

Let p be the probability of having a female Martian, and of course, 1-p the probability of having a male Martian.

To compute the expected total number of trials before 2 males are born, imagine an experiment simulating the fact that 2 males are born is performed n times.

Let ak be the number of trials performed until 2 males are born in experiment k. That is,

a1= number of trials performed until 2 males are born in experiment 1

a2= number of trials performed until 2 males are born in experiment 2

and so on.

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<em>We have then that the expected number of trials before 2 males are born is 2/(1-p) where p is the probability of having a female. </em>

a)

Here we have the probability of having a male is half as likely as females. So

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The expected number of trials would be

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This means <em>the couple would have 6 children</em>: 4 females (the first 4 trials) and 2 males (the last 2 trials).

b)

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c)

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2 years ago
Word form for 10 times 10 times 10 times 10 times 10
Volgvan
Ten to the power of five.
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