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evablogger [386]

4 years ago

8

An item costs c dollars and 6% sales tax is charged... You are buying a skateboard that costs $75. What is the cost of the skate

board including sales tax?

2 answers:

Dmitry_Shevchenko [17]4 years ago

8 0

Hello, you can write it as 1.06c the price with the tax added (derived from c (1 + rate))

So, 1.06 * 75 = $79,5 would be our final price

slamgirl [31]4 years ago

7 0

$75 ×6 %
=$75×6/100
=$4.5
$75+ $4.5
=$79.5

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Harlamova29_29 [7]

Answer:

The answer is below

Step-by-step explanation:

Given that:

mean (μ) = 70 years, standard deviation (σ)= 5.5 years.

a) The z score measures how many standard deviation a raw score is above or below the mean. It is given as:

$z=\frac{x-\mu}{\sigma}$ , for a sample size of n, the z score is: $z=\frac{x-\mu}{\sigma/\sqrt{n} }$

Given a sample of 5 turtles, we have to calculate the z score for x = 60 and x = 80.

For x = 60:

$z=\frac{x-\mu}{\sigma/\sqrt{n} }=\frac{60-70}{5.5/\sqrt{5} } =-4.07$

For x = 80:

$z=\frac{x-\mu}{\sigma/\sqrt{n} }=\frac{80-70}{5.5/\sqrt{5} } =4.07$

The probability that a mean life of a random sample of 5 such turtles falls between 60 and 80 years = P(60 < x < 80) = P(-4.07 < z < 4.07) = P(z < 4.07) - P(z < -4.07) = 1 - 0 = 1 = 100%

b) The z score that corresponds to top 10% is -1.28.

$z=\frac{x-\mu}{\sigma/\sqrt{n} }\\\\-1.28=\frac{x-70}{5.5/\sqrt{5} }\\ x-70=-3\\x=70-3\\x=67\ years$

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Step-by-step explanation:

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Rudiy27

<span>68=-16t2+64t+8
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zlopas [31]

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