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3 years ago

Can someone perz help

Mathematics

2 answers:

a_sh-v [17]3 years ago

8 0

Answer:

2/1

Step-by-step explanation:

If it's heads 20 times then it's tails 10 times since the coin is flipped 30 times in total

The ratio of heads to tails is 20/10➡2/1

storchak [24]3 years ago

7 0

A is the correct answer cause you get heads twice as often as tails

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Ira Lisetskai [31]

Answer:

858 the next one is 947

Step-by-step explanation:

I hope it's right bye

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2 years ago

Joe is training for a race in 30 days. He needs to run a total of 135 miles. How many miles will joe need to run each day to be

marin [14]

He needs to run 4.5 miles each day.

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2 years ago

How to do number 15?

tatiyna

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2 years ago

What is the result of multiplying the first equation by −3 and adding to the second equation?

Alla [95]

Answer:

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4 0

2 years ago

The average daily volume of a computer stock in 2011 was ų=35.1 million shares, according to a reliable source. A stock analyst

Shtirlitz [24]

Answer:

The null hypothesis is $H_o : \mu = 35 .1 \ million \ shares$

The alternative hypothesis $H_a : \mu \ne 35.1\ million \ shares$

The 95% confidence interval is $27.475 < \mu < 37.925$

Step-by-step explanation:

From the question the we are told that

The population mean is $\mu = 35.1 \ million \ shares$

The sample size is n = 30

The sample mean is $\= x = 32.7 \ million\ shares$

The standard deviation is $\sigma = 14.6 \ million\ shares$

Given that the confidence level is $95\%$ then the level of significance is mathematically represented as

$\alpha = 100-95$

$\alpha = 5\%$

=> $\alpha = 0.05$

Next we obtain the critical value of $\frac{\alpha }{2}$ from the normal distribution table

The value is $Z_{\frac{\alpha }{2} } = 1.96$

Generally the margin of error is mathematically represented as

$E = Z_{\frac{\alpha }{2} } * \frac{ \sigma }{\sqrt{n} }$

substituting values

$E = 1.96 * \frac{ 14.6 }{\sqrt{30} }$

$E = 5.225$

The 95% confidence interval confidence interval is mathematically represented as

$\= x -E < \mu < \= x +E$

substituting values

$32.7 - 5.225 < \mu < 32.7 + 5.225$

$27.475 < \mu < 37.925$

6 0

2 years ago