I don't understand this question

Mathematics

1 answer:

igor_vitrenko [27]4 years ago

8 0

It wants to know how much one tshirt is. Susan did the problem wrong, they want to know if know how to do it right. She should have divided $12.75 by 3 not subtracted $2. :) I hope this helps :)

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Describe the end behavior of this function f(x) = x^3-2

kicyunya [14]

Answer:

Step-by-step explanation:

As x increases so does f(x)

End behaviour - the function increases without bounds.

4 0

4 years ago

When Carson runs the 400 meter dash, his finishing times are normally distributed with a mean of 65 seconds and a standard devia

just olya [345]

Given Information:

Mean time to finish 400 meter dash = μ = 65 seconds

Standard deviation to finish 400 meter dash = σ = 2.5 seconds

Confidence level = 95%

Required Information:

95% confidence interval = ?

Answer:

$CI = 60 \: to \: 70 \: seconds$

Step-by-step explanation:

In the normal distribution, the empirical rule states approximately 68% of all the data lie within 1 standard deviation from the mean, approximately 95% of all the data lie within 2 standard deviations from the mean and approximately 99.7% of all the data lie within 3 standard deviations from the mean.

The confidence interval for 95% confidence limit is given by

$CI = \mu \pm 2\sigma$

Since approximately 95% of all the data lie within 2 standard deviations from the mean. μ is the mean time Carson takes to finish 400 meter dash and σ is the standard deviation.

$CI = 65 \pm 2(2.5)$