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astra-53 [7]
3 years ago
5

Erin is 3 years older than Maddie. Let m represent Maddie's age. Let e represent Erin's age. Create an equation to show Maddie's

age, m, in terms of Erin's age, e. Make sure you answer it correctly. Also, please explain. Thanks.! :)
Mathematics
1 answer:
hodyreva [135]3 years ago
6 0
Erin age = e
Maddie age = m
E= M+3
because Erin = Maddies age + 3 years

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In a certain​ country, the true probability of a baby being a girlgirl is 0.4810.481. among the next sixsix randomly selected bi
Ilia_Sergeevich [38]
Probability of the next six babies being a girl  = (0.4810)^6 = 0.0124

Therefore probability of at least one boy in next six births = 1 - 0.0124

=  0.9876  Answer


4 0
3 years ago
A test consists of 20 problems and students are told to answer any 10 of these questions. In how many different ways can they ch
Furkat [3]
We must find UNIQUE combinations because choosing a,b,c,d... is the same as d,c,b,a...etc.  For this type of problem you use the "n choose k" formula...

n!/(k!(n-k)!), n=total number of choices available, k=number of choices made..

In this case:

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184756
3 0
3 years ago
Read 2 more answers
From 19 measurements of a pressure controller, the mean operating pressure is 4.97 kPa with a standard deviation of 0.0461 kPa.
Semenov [28]

Answer:

4.97-2.10\frac{0.0461}{\sqrt{19}}=4.95    

4.97+2.10\frac{0.0461}{\sqrt{19}}=4.99    

So on this case the 95% confidence interval would be given by (4.95;4.99)  

Step-by-step explanation:

Previous concepts

A confidence interval is "a range of values that’s likely to include a population value with a certain degree of confidence. It is often expressed a % whereby a population means lies between an upper and lower interval".

The margin of error is the range of values below and above the sample statistic in a confidence interval.

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".

\bar X =4.97 represent the sample mean

\mu population mean (variable of interest)

s=0.0461 represent the sample standard deviation

n=19 represent the sample size  

Confidence interval

The confidence interval for the mean is given by the following formula:

\bar X \pm t_{\alpha/2}\frac{s}{\sqrt{n}}   (1)

In order to calculate the critical value t_{\alpha/2} we need to find first the degrees of freedom, given by:

df=n-1=19-1=18

Since the Confidence is 0.95 or 95%, the value of \alpha=0.05 and \alpha/2 =0.025, and we can use excel, a calculator or a table to find the critical value. The excel command would be: "=-T.INV(0.025,18)".And we see that t_{\alpha/2}=2.10

Now we have everything in order to replace into formula (1):

4.97-2.10\frac{0.0461}{\sqrt{19}}=4.95    

4.97+2.10\frac{0.0461}{\sqrt{19}}=4.99    

So on this case the 95% confidence interval would be given by (4.95;4.99)    

5 0
3 years ago
Help me out pleaseeee
gladu [14]

4x - y = 5 --> 4x = y + 5

substitute

4x + 4y = -4

(y + 5) + 4y = -4

5y + 5 = -4

5y = -9

y = -1.8

solve x

4x = y + 5 = -1.8 + 5 = 3.2

x = 3.2/4 = 0.8

6 0
3 years ago
What are your plans for the future?Which profession would you like to pursue and why?​
iren2701 [21]
I plan on attending collage, and getting my masters degree. i would like to become a nurse! i want to be a nurse to help people and be able to know i’m doing something good!!
5 0
2 years ago
Read 2 more answers
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