Help.Explain. I’m confused.

Mathematics

2 answers:

Blizzard [7]4 years ago

5 0

Jessie because you need to use the strategy kcf keep change flip so it will be Jessie you must divide 7/9 by 4/9

Darina [25.2K]4 years ago

3 0

I think Jessie is correct because if u mutipy those two numbers so therefore Jessie is correct if you need me to explain more plz let me knoe

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Mr. Rucker has a choice of 243 television stations with his satellite provider. How is 243 written with an exponent using 3 as t

Otrada [13]

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3 years ago

Read 2 more answers

What is the lowest common multiple of 42 and 63?

gtnhenbr [62]

Because 42 doesn't go into 63, you have to go larger. Start by multiplying 63 by 2.

63*2=126

42 goes into 126 3 times even, so the LCM of 42 and 63 is 126 :)

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3 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.

$CI = 65 \pm 2(2.5)$