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irga5000 [103]
3 years ago
14

18

Mathematics
1 answer:
Alla [95]3 years ago
6 0

Answer:

40x30= 1200, 20x15=300, 300/1200= 1/4.

Step-by-step explanation:

You can also visualize it. Imagine a field 40’ long and the boy cut the top 20’ of it but left 20’ of the bottom, he would have cut half of it at this point. Now it’s 30’ wide and he cut the left 15’ of what’s remaining but left the right 15’ uncut. So now there’s a 20’x15’ bottom right corner left uncut. There are 4 sections that are 20’x15’ and he left one out of four uncut, otherwise written as 1/4.

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Kim and Courtney share a16 ounce box of cereal. By the end of the week, Kim has eaten 3/8 of the box and Courtney has eaten 1/4
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Read 2 more answers
Here are some (simulated) data on the maximum age distribution in rabbits:
bogdanovich [222]

Let Y denote the maximum age of rabbit.

To calculate probability for Y=a from given table, we need to divide frequency corresponding to y=a with sum of frequencies.

For example P(Y=0) = \frac{37}{37+232+429+388+225+99+58+10+6+0} =\frac{37}{1484} = 0.02493

Like that P(y=1) = 0.1563, P(Y=2) = 0.2891, P(y=3) = 0.2615, P(Y=4) = 0.1516,

P(Y=5) = 0.0667, P(Y=6) = 0.0391,P(Y=7) = 0.0067, P(Y=8)=0.004 and P(Y=9) =0.

a) P(Y>5) = P(Y=6)+P(Y=7)+P(Y=8)+P(Y=9)

              = 0.0391+0.0067+0.004+0 = 0.0498

b) P(2<Y<6) = 0.2615+0.1516+0.0667 = 0.4798

c) P(Y≥3) = 0.2615+0.1516+0.0667+0.0391+0.0067+0.004+0= 0.5296

d)P(Y<6) = 0.02493+0.1563+0.2891+0.2615+0.1516+0.0667 =0.95013

e)If we add (a) and (d), we will get 0.0498+0.95013 = 0.99993≈1

Not surprised,since this is nothing but addition of probabilities for all Y values.

That's we got 1 since numerator and denominator are same.

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3 years ago
(c) if the mean thickness is 10 micrometers, what should the standard deviation of thickness equal so that the probability that
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Ask google to find out

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