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Marianna [84]
3 years ago
7

25.5 is what fraction

Mathematics
2 answers:
insens350 [35]3 years ago
8 0
It can have a lot of answers but in simplest form it would be 51 over 2 or 25 1/2
kolbaska11 [484]3 years ago
6 0
25 <span>1⁄2</span> hope it helped

Improper fraction:
\frac{52}{2}


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Suppose that the sample standard deviation was s = 5.1. Compute a 98% confidence interval for μ, the mean time spent volunteerin
NISA [10]

Answer:

The 95% confidence interval would be given by (5.139;5.861)  

Step-by-step explanation:

1) 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 represent the sample mean for the sample  

\mu population mean (variable of interest)

s represent the sample standard deviation

n represent the sample size  

2) Confidence interval

Assuming that \bar X =5.5 and the ranfom sample n=1086.

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=1086-1=1085

Since the Confidence is 0.98 or 98%, the value of \alpha=0.02 and \alpha/2 =0.01, and we can use excel, a calculator or a table to find the critical value. The excel command would be: "=-T.INV(0.01,1085)".And we see that t_{\alpha/2}=2.33

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

5.5-2.33\frac{5.1}{\sqrt{1086}}=5.139    

5.5+2.333\frac{5.1}{\sqrt{1086}}=5.861

So on this case the 95% confidence interval would be given by (5.139;5.861)    We are 98% confident that the mean time spent volunteering for the population of parents of school-aged children is between these two values.

5 0
3 years ago
This is a GCSE maths question which i don’t understand.
Tpy6a [65]

Answer:

15

Step-by-step explanation:

7 0
3 years ago
Pls tell me some answers for this
devlian [24]

Answer:

∠B ≈ 56.25°

Step-by-step explanation:

Since the triangle is right use the cosine ratio to solve for B

cosB = \frac{adjacent}{hypotenuse} = \frac{BC}{AB} = \frac{5}{9}, thus

B = cos^{-1}(\frac{5}{9} ) ≈ 56.25°

3 0
3 years ago
Read 2 more answers
15 decreased by twice a number x in algebriac expression
postnew [5]
2x - 15

15 is decreased that is the key word here which indicates subtraction.

twice a number with given variable x is 2x

subtraction always goes behind so 2x - 15
4 0
3 years ago
The length of the room is 3 times the width and the total area of the room is 27 square meters. What is the length of the living
Vika [28.1K]
l=3w\\&#10;lw=27\\\\&#10;3w\cdot w=27\\&#10;3w^2=27\\&#10;w^2=9\\&#10;w=3 \vee w=-3\\&#10;-3\not\in\mathbb{N}\\\\&#10;l=3\cdot3\\&#10;l=9&#10;
7 0
3 years ago
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