3 years ago

0.7(2.7 + 2f) simplify the expression?

Mathematics

1 answer:

Dafna1 [17]3 years ago

6 0

Answer:

1.89+1.4f

Step-by-step explanation:

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Eric is studying people's typing habits. He surveyed 525 people and asked whether they leave one space or two spaces after a per

Otrada [13]

Answer: (0.8115, 0.8645)

Step-by-step explanation:

Let p be the proportion of people who leave one space after a period.

Given: Sample size : n= 525

Number of people responded that they leave one space. =440

i.e. sample proportion: $\hat{p}=\dfrac{440}{525}\approx0.838$

z-score for 90% confidence level : 1.645

Formula to find the confidence interval :

$\hat{p}\pm z^*\sqrt{\dfrac{\hat{p}(1-\hat{p})}{n}}$

$0.838\pm (1.645)\sqrt{\dfrac{0.838(1-0.838)}{525}}\\\\=0.838\pm (1.645)\sqrt{0.00025858285}\\\\=0.838\pm (1.645)(0.01608)\\\\= 0.838\pm0.0265\\\\=(0.838-0.0265,\ 0.838+0.0265)\\\\=(0.8115,\ 0.8645)$

Hence, a 90% confidence interval for the proportion of people who leave one space after a period: (0.8115, 0.8645)

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3 years ago

Does anyone know this? Also, can you explain how you get the answer? cuz I have 10 other questions same as this.

Nezavi [6.7K]

The answer is 36

Multiply each side by 9

9 times for and 9 times n/9

The n/9 will cancel out so you are left with n= 9 times 4

This comes to 36

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3 years ago

How long will it take to drive 30 miles going 15 mph?

mrs_skeptik [129]

Distance=speed times time

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so
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Step-by-step explanation:

whether it's a negative or positive, absolute numbers are always positive!!

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