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3 years ago

GUYS PLEASE HELP ME PLEASE HELP ME PLEASE PLEASE!!!!!

Mathematics

1 answer:

Pani-rosa [81]3 years ago

3 0

Answer:

2y-8

Step-by-step explanation:

-y-5+y+2(2y-y)-3

Do the parenthesis first

-y-5+y+2(y)-3

Multiply

-y-5+y+2y-3

Combine like terms

2y-8

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Answer: (iii) Profit The marked price of an article is 15% above its selling price and the cost price is 25% less tha its marked price. Find the discount percent and gain percent.

Step-by-step explanation:

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3 years ago

Ella read 16 pages of her book on Monday and 26 pages on Tuesday .there are 64 pages in the book. how many more pages are left f

dimaraw [331]

16 + 26 = 42
64 - 42 = 22

22 pages

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4 years ago

HELp <br> Which relation is a function?

madreJ [45]

It is the first one because you can use the vertical line test to see that it doesn’t hit more than one point per x-value

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3 years ago

Help me please brainly

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3 years ago

In a survey, 498 out of 1,397 us adults said they drink at least 4 cups of coffee a day. find a point estimate (p) for the popul

valentinak56 [21]

Let X be the number of adults who drink at least 4 cups of coffee a day. Let n be the sample size and p be the proportion of adults who drink at least 4 cups of coffee a day.

Given : n=1397 and x =498

a. Point estimate p for the population proportion is sample proportion

p = x/n = 498/1397 = 0.3564

p= 0.3564

b .90% confidence interval for population proportion.

The distribution of sample proportion is normal with parameters

mean =p =0.3564

standard deviation = $\sqrt{\frac{p*(1-p)}{n}}$

= $\sqrt{\frac{0.3564*(1-0.3564)}{1397}}$

standard deviation = 0.0128

The 90% confidence interval for population proportion is

(p - Margin of error, p+ margin of error)

where Margin of error = $z _{\alpha/2}\sqrt{\frac{p*(1-p)}{n} }$

where $z_{\alpha/2}$ is critical z score value for 90% confidence interval

alpha = 1- c = 1 - 0.9 = 0.1

$z_{\alpha/2}$ = $z_{0.1/2}$ = z (0.05)

This is z score value for which probability below -z is 0.05 and probability above z is 0.05

Using excel function to find z score for probability 0.05

P(Z < z) = 0.05

z = NORM.S.INV(0.05) = -1.645

For calculating confidence interval we consider positive z score value

z = 1.645

Margin of error = $z _{\alpha/2}\sqrt{\frac{p*(1-p)}{n} }$

= $1.645\sqrt{\frac{0.3564*(1-0.3564)}{1397} }$

= 1.645 * 0.0128

Margin of error = 0.021

The 90% confidence interval for population proportion is

(p - Margin of error, p+ margin of error)

(0.3564 - 0.021, 0.3564 + 0.021)

(0.3354 , 0.3774)

a 90% confidence interval for the proportion of adults who drink at least 4 cups of coffee a day is (0.3354, 0.3774)

8 0

4 years ago