3 years ago

If there are 12 boys and 20 students, write as a ratio for boys to students in 3 ways.

Mathematics

1 answer:

ruslelena [56]3 years ago

3 0

12:20

6:10

3:5

Hope that helps :)

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Step-by-step explanation:

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Step-by-step explanation:

depending on how they round your answer the number might look different.

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3 years ago

the diameters of Douglas firs grown at a Christmas tree farm are normally distributed with a mean of 4 inches and a standard dev

aksik [14]

Answer:

Proportion of the trees will have diameters between 2 and 6 inches = 0.8164

Step-by-step explanation:

Given -

Mean $(\nu )$ = 4

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proportion of the trees will have diameters between 2 and 6 inches =

$P(2< X< 6)$ = $P(\frac{2 - 4 }{1.5}< \frac{X - \nu }{\sigma}< \frac{6 - 4 }{1.5})$

= $P(\frac{-2 }{1.5}< Z< \frac{2 }{1.5})$ Put [ $Z = \frac{X - \nu }{\sigma}$ ]

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3 years ago