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maks197457 [2]
3 years ago
9

Any two normal curves are the same except for their Multiple Choice standard deviations. means. standard deviations and means. s

tandard deviations, means, skewness, and kurtosis.
Mathematics
1 answer:
Neko [114]3 years ago
7 0

Answer:

Standard deviation, means, skewness and kurtosis.

Step-by-step explanation:

Two normal curves may be same but they have different means, standard deviation and skewness. There can be different standard deviation for two curves and there is difference in skewness.

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The average heights of a random sample of 400 people from a city is 1.75 m. It is known that the heights of the population are r
Dimas [21]

Answer:

The 95% confidence interval for the average heights of the population is between 1.7108m and 1.7892m.

Step-by-step explanation:

We have that to find our \alpha level, that is the subtraction of 1 by the confidence interval divided by 2. So:

\alpha = \frac{1-0.95}{2} = 0.025

Now, we have to find z in the Ztable as such z has a pvalue of 1-\alpha.

So it is z with a pvalue of 1-0.025 = 0.975, so z = 1.96

Now, find M as such

M = z*\frac{\sigma}{\sqrt{n}}

In which \sigma is the standard deviation of the population and n is the size of the sample.

The standard deviation is the square root of the variance. So

\sigma = \sqrt{0.16} = 0.4

Then

M = 1.96*\frac{0.4}{\sqrt{400}} = 0.0392

The lower end of the interval is the mean subtracted by M. So it is 1.75 - 0.0392 = 1.7108m

The upper end of the interval is the mean added to M. So it is 1.75 + 0.0392 = 1.7892m

The 95% confidence interval for the average heights of the population is between 1.7108m and 1.7892m.

4 0
3 years ago
There are 158 birds on the endangered species list in some year. this is 16 more than twice the number of reptiles on the list.
S_A_V [24]
Let the number of reptiles on endangered list be 'x'

2x + 16=158

2x=158-16

2x=142

x=71

So there are 71 reptiles on the endangered list
5 0
3 years ago
4. Sam Howard's bank charges a $1.23
Mamont248 [21]
The answer is D I know that because I do this all the time
8 0
3 years ago
6. Use synthetic substitution to evaluate the polynomial P(x) = x - 4x² + 4x – 5 for x = 4
Tatiana [17]

Answer:

When x=4

P(x) =4 - 4(4)^2 + 4(4) -5

=4 - 4(16) + 16 -5

=4 - 64 +11

= -60 + 11

= -49

8 0
3 years ago
Write a expression that represents 72 divided by n plus 4
jeka57 [31]

Answer:

72 divided by n + 4

Step-by-step explanation:

its actually directly in the picture

5 0
3 years ago
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