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guajiro [1.7K]
2 years ago
8

8.57×10*-4 in standard form​

Mathematics
2 answers:
Stells [14]2 years ago
8 0

Answer:

342.8

Step-by-step explanation:

xxMikexx [17]2 years ago
4 0

Answer:

The required standard form is: 0.000857

Step-by-step explanation:

Consider the provided number.

8.57\times 10^{-4}

If the exponent of 10 is a negative number then move the decimal point to the left.

If the exponent of 10 is a positive number then move the decimal point to the right

Here the exponent of 10 is a negative number so move the decimal point left.

Hence the required standard form is: 0.000857

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Arbitron Media Research Inc. conducted a study of the iPod listening habits of men and women. One facet of the study involved th
Dovator [93]

Answer:

No ;

Step-by-step explanation:

Given ;

s2 = 10 ; n2 = 10 ; s1 = 12 ; n1 = 12

Hypothesis :

H0 : σ1² = σ2²

H1 : σ1² ≠ σ2²

The test statistic :

Ftest = s1² / s2² = 12² / 10² = 144 / 100 = 1.44

The Pvalue using the Pvalue from Ftest calculator :

Numerator df = 12 - 1 = 11

Denominator df = 10 - 1 = 9

Pvalue = 0.2969

At α = 0.1

If Pvalue > α ; Fail to reject H0

0.2969 > 0.1 ; Hence, we fail to reject the Null

Hence, we cannot conclude that variation exists

3 0
2 years ago
How do you find the area of a semicircle when the diameter is 10?
PolarNik [594]

Answer:6.28 units sq

Step-by-step explanation:

To find the area of a semi ..circle

Area of semi- circle=1/2πr^2

d=10 r=2

A=1/2×3.14×2×2

A=6.28 units sq

5 0
3 years ago
Read 2 more answers
normally distributed with mean 24.6 seconds and standard deviation 0.64 seconds;the lower finishing time, the better. If the qua
marshall27 [118]

Answer:

z=1.04

And if we solve for a we got

a=24.6 +1.04*0.64=25.27

So the value of height that separates the bottom 85% of data from the top 15% is 25.27.  

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 that represent the finishing time of a population, and for this case we know the distribution for X is given by:

X \sim N(24.6,0.64)  

Where \mu=24.6 and \sigma=0.64

Solution to the problem

For this part we want to find a value a, such that we satisfy this condition:

P(X>a)=0.15   (a)

P(X   (b)

Both conditions are equivalent on this case. We can use the z score again in order to find the value a.  

As we can see on the figure attached the z value that satisfy the condition with 0.85 of the area on the left and 0.15 of the area on the right it's z=1.04. On this case P(Z<1.04)=0.85 and P(z>1.04)=0.15

If we use condition (b) from previous we have this:

P(X  

P(z

But we know which value of z satisfy the previous equation so then we can do this:

z=1.04

And if we solve for a we got

a=24.6 +1.04*0.64=25.27

So the value of height that separates the bottom 85% of data from the top 15% is 25.27.  

3 0
2 years ago
2. What helps you to get the root of a number?​
xeze [42]

Answer:

Separate The Digits Into Pairs.

Step-by-step explanation:

4 0
2 years ago
Read 2 more answers
What’s the slope of x+2y=-8?
mash [69]

Answer:

- 1/2

Step-by-step explanation:

We use the slope-intercept form to figure out our slope.

y = mx + b

Get y alone:

x + 2y = -8

2y = -x - 8

y = -x/2 - 4

Since m is the slope in y = mx + b, we can see that -1/2 is in the place of m, therefore our slope is -1/2

7 0
1 year ago
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