Answer: Simplifying ratios is just like simplifying fractions. Think of ratios as fractions. You divide a number that both numerator and denominator can be divided by.

Example

5/10 = 1/2

How did we get 1/2? Simple! You divide the numerator and denominator by 5.

5/10÷5/5=1/2

You do the same for ratios but the only difference is instead of putting a fraction bar (/) you put a colon (:)

Let's try another example but with a ratio!

Example

5:10 = 1:2

How did we get 1:2? Simple! Again we divided by 5 just like we did with the fraction example! So really ratios are just like fractions!

5:10÷5:5=1:2

Remember

The fraction bar is /

The ratio bar is :

Ratios are just like fractions but the symbol can sometimes trick people.

3 0

3 years ago

Suppose that the age that children learn to walk is normally distributed with mean 12 months and standard deviation 1 month. 19

Gnesinka [82]

Answer with explanation:

Given : The age that children learn to walk is normally distributed with $\mu=12\text{ months}$ and $\sigma=1\text{ month}$ .

Let x be the age that children learn to walk .

B) Using formula $z=\dfrac{x-\mu}{\dfrac{\sigma}{\sqrt{n}}}$

n= 19

For x= 11.5

$z=\dfrac{11.5-12}{\dfrac{1}{\sqrt{19}}}=-2.18$

For x= 12.5

$z=\dfrac{12.5-12}{\dfrac{1}{\sqrt{19}}}=2.18$

Then, by using the z-value table , for the 19 people, the probability that the average age that they learned to walk is between 11.5 and 12.5 months old will be :-

$P(-2.18$