In rough water, a small sand dollar burrows -1/2 centimeter into the sand. A larger sand dollar burrows -1 1/4 centimeters into
2 answers:
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Answer:
And the explanation of this number is:"The number of text messages for Kendra it's 2.26 deviations above the mean"
Step-by-step explanation:
1) 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".
2) Calculate the z score
Let X the random variable that represent the number of text messages per month, and for this case we know the distribution for X is given by:
Where and
And the best way to solve this problem is using the normal standard distribution and the z score given by:
If we apply this formula to our probability we got this:
And the explanation of this number is:"The number of text messages for Kendra it's 2.26 deviations above the mean"
<h2>The product of the rational expressions
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Step-by-step explanation:
We have,
To find, the product of the rational expressions = ?
∴
=
=
=
=
Thus, the product of the rational expressions .