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3 years ago

The Boardman family walked two over five of a mile in two over seven of an hour. What is their unit rate in miles per hour?

Mathematics

1 answer:

hichkok12 [17]3 years ago

3 0

If the family walked 2/5 of a mile in 2/7 of an hour their MPH would be 2.8mph

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Alexandra buys sweatshirts for $12 each. In her store, she sells each sweatshirt for $30.

serious [3.7K]

Multiply $30 by .25 you get, it's $7.50so you subtract $7.50 from $30 and you get $22.50. Then multiply 2 (sweaters) by $22.50 and you get $45,but wait you still have to multiply that sales tax so you multiply .04 by $45 and you get $1.80, later you subtract $1.80 from $45 and you get $43.20(the cost of the two sweaters) I did part1 only cuz' no I have no time left Sorry for the inconvenience

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4 years ago

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Samuel has 20$ in his savings account before he makes a deposit of $160. After 2 weeks, he withdraws $160. How did samuels savin

olganol [36]

Since he deposited 160 then took out 160 it did not change

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3 years ago

HELPPPPP IF U HAVE DONE THIS ASSIGNMENT B4

lianna [129]

Answer:

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3 years ago

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According to a recent study of 7335 young people in the US, 30% had been arrested for a crime other than a traffic violation by

victus00 [196]

Answer:

a) Statistic.

b) The population proportion is expected to be between 0.29 and 0.31 with a 94% degree of confidence.

Step-by-step explanation:

a) The proportion of 30% is a statistic, as it is a value that summarizes data only from the sample taken in the study from USA Today. Other samples may yield different proportions.

b) We can use the statistic to estimate a confidence interval for the parameter of the population.

The standard error for the proportion is calculated as:

$\sigma_p=\sqrt{\dfrac{p(1-p)}{N}}=\sqrt{\dfrac{0.3\cdot 0.7}{7335}}=\sqrt{2.83\cdot10^5}= 0.00535$

The margin of error is 0.01. We can use this value to determine the level of confidence that represents.

The formula for the margin of error is:

$E=z\cdot \sigma_p=0.01\\\\z\cdot 0.0535=0.01\\\\z=1.87$

This z-value, according to the the standard normal distribution, corresponds to a confidence interval of 94%.

The interval for this margin of error is:

$p-E\leq \pi \leq p+E\\\\0.30-0.01\leq \pi \leq 0.30+0.01\\\\0.29\leq \pi \leq 0.31$

Then, we can conclude that the population proportion is expected to be between 0.29 and 0.31 with a 94% degree of confidence.

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4 years ago

You have taken a long position in a call option on IBM common stock. The option has an exercise price of $142 and IBM's stock cu

REY [17]

Answer:

Step-by-step explanation:

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3 years ago