I need to know for my hw

Mathematics

1 answer:

mars1129 [50]3 years ago

4 0

one and aa half hour

HOPE THIS WILL HELP YOU

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I need answer for this any one help me please

WITCHER [35]

Answer:

C = 97.20

Step-by-step explanation:

Given that C varies as r² then the equation relating them is

C = kr² ← k is the constant of variation

To find k use the condition C = 202.80 when r = 2.6

k = $\frac{C}{r^{2} }$ = $\frac{202.8}{2.6^{2} }$ = 30

C = 30r² ← equation of variation

When r = 1.8, then

C = 30 × 1.8² = 97.20

6 0

4 years ago

Need help with finding A and B

Maslowich

Hello!

First of all, let's find A. This is the opposite and hypotenuse we will be dealing with. Therefore, we will use the sin.

sin30= 0.5

This gives us the equation below.

a/12=0.5

a=6

Now we find b. This is the adjacent and hypotenuse. Therefore, we will use the cosine.

cos30≈0.87

This gives us the equation below.

b/12=0.87

b=10.44

I hope this helps!

3 0

3 years ago

If the distribution is really N ( 5.43 , 0.54 ) , N(5.43,0.54), what proportion of observations would be less than 5.05 ? 5.05?

Ipatiy [6.2K]

Answer:

$P(X$

And we can use the following excel code to find the answer: "=NORM.DIST(-0.704,0,1,TRUE)"

Step-by-step explanation:

Previous concepts

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".

The Z-score is "a numerical measurement used in statistics of a value's relationship to the mean (average) of a group of values, measured in terms of standard deviations from the mean".

Solution to the problem

Let X the random variable of interest for a population, and for this case we know the distribution for X is given by:

$X \sim N(5.43,0.54)$