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3 years ago

7

Rasheed needs to say $231 to earn money he plans to wash cars and charge $12 for car right to estimates Rasheed could use to det

ermine how many cars he needs to wash

2 answers:

geniusboy [140]3 years ago

6 0

About 20 cars. Easiest way to figure it out is do 231$ divides by 12$ and get 19.25, so 20.

PilotLPTM [1.2K]3 years ago

4 0

The answer is 16 the original answer was a decimal but you cannot split a car in half so that is what I got

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3 years ago

The first eight quizzes in this class had average scores of 8,9,9,8,8,9,8,7. This gives a sample mean of 8.25 and a sample stand

alexira [117]

Answer:

<em>Test statistic </em>

<em> </em> $t = \frac{x^{-} -mean}{\frac{S}{\sqrt{n} } }$

t = <em>1.076</em>

Step-by-step explanation:

<u><em>Step(i):-</em></u>

Given Mean of the Population (μ) = 8.0

<em>Mean of the sample (x⁻) = 8.25</em>

Given data

8,9,9,8,8,9,8,7

Given sample size n= 8

Given sample standard deviation(S) = 0.661

<u><em>Step(ii):-</em></u>

<em>Null hypothesis : H: (μ) = 8.0</em>

<em>Alternative Hypothesis :H:(μ) > 8.0</em>

<em>Degrees of freedom = n-1 = 8-1=7</em>

<em>Test statistic </em>

<em> </em> $t = \frac{x^{-} -mean}{\frac{S}{\sqrt{n} } }$ <em></em>

<em> </em> $t = \frac{8.25 -8.0}{\frac{0.661}{\sqrt{8} } }$ <em></em>

<em> t = 1.076</em>

<em>Critical value </em>

<em> t₍₇,₀.₀₅₎ = 2.3646</em>

<em>The calculated value t = 1.076 < 2.3646 at 0.05 level of significance</em>

<em>Null hypothesis is accepted</em>

<em>Test the hypothesis that the true mean quiz score is 8.0 against the alternative that it is not greater than 8.0</em>

<em></em>

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3 years ago

if you flipped a coin 20 times, in percentage how many times do you expect the coin to land on heads, an how many times on tails

djyliett [7]

Answer:

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Step-by-step explanation:

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3 years ago