Zach's baseball team is raising money for a charity. Zach is tasked with raising at least $250. If represents the amount of money Zach raises, which inequality represents this situation?a. x>250

b. x<_250

c. x>_250

d. x<250

Answers

Answer 1

Answer:

Answer: x ≥ 250

Step-by-step explanation:

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The table below gives the list price and the number of bids received for five randomly selected items sold through online auctions. Using this data, consider the equation of the regression line, yˆ=b0+b1x, for predicting the number of bids an item will receive based on the list price. Keep in mind, the correlation coefficient may or may not be statistically significant for the data given. Remember, in practice, it would not be appropriate to use the regression line to make a prediction if the correlation coefficient is not statistically significant. Price in Dollars 25 33 34 45 48
Number of Bids 2 3 4 5 7

Step 1 of 6: Find the estimated slope. Round your answer to three decimal places.
Step 2 of 6: Find the estimated y-intercept. Round your answer to three decimal places.Step 3 of 6: Find the estimated value of y when x = 34. Round your answer to three decimal places.Step 4 of 6: Determine the value of the dependent variable yˆ at x = 0.Step 5 of 6: Substitute the values you found in steps 1 and 2 into the equation for the regression line to find the estimated linear model. According to this model, if the value of the independent variable is increased by one unit, then find the change in the dependent variable yˆ.Step 6 of 6: Find the value of the coefficient of determination.

Answers

Answer:

1) b1=5.831

2) b0=12.510

3) y(34)=210.764

4) y(0)=12.510

5) y=12.510+5.831x

6) R^2=0.85

Step-by-step explanation:

We have the linear regression model $y=b_0+b_1 x$ .

We start by calculating the all the parameters needed to define the model:

- Mean of x:

$\bar x=(1)/(5)\sum_(i=1)^(5)(2+3+4+5+7)=(21)/(5)=4.2$

- Uncorrected standard deviation of x:

$s_x=\sqrt{(1)/(n)\sum_(i=1)^(5)(x_i-\bar x)^2}\n\n\ns_x=\sqrt{(1)/(5)\cdot [(2-4.2)^2+(3-4.2)^2+(4-4.2)^2+(5-4.2)^2+(7-4.2)^2]}\n\n\n s_x=\sqrt{(1)/(5)\cdot [(4.84)+(1.44)+(0.04)+(0.64)+(7.84)]}\n\n\n s_x=\sqrt{(14.8)/(5)}=√(2.96)\n\n\ns_x=1.72$

- Mean of y:

$\bar y=(1)/(5)\sum_(i=1)^(5)(25+33+34+45+48)=(185)/(5)=37$

- Standard deviation of y:

$s_y=\sqrt{(1)/(n)\sum_(i=1)^(5)(y_i-\bar y)^2}\n\n\ns_y=\sqrt{(1)/(5)\cdot [(25-37)^2+(33-37)^2+(34-37)^2+(45-37)^2+(48-37)^2]}\n\n\n s_y=\sqrt{(1)/(5)\cdot [(144)+(16)+(9)+(64)+(121)]}\n\n\n s_y=\sqrt{(354)/(5)}=√(70.8)\n\n\ns_y=8.414$

- Sample correlation coefficient

$r_(xy)=\sum_(i=1)^5((x_i-\bar x)(y_i-\bar y))/((n-1)s_xs_y)\n\n\nr_(xy)=((2-4.2)(25-37)+(3-4.2)(33-37)+...+(7-4.2)(48-37))/(4\cdot 1.72\cdot 8.414)\n\n\nr_(xy)=(69)/(57.888)=1.192$

Step 1

The slope b1 can be calculated as:

$b_1=r_(xy)(s_y)/(s_x)=1.192\cdot(8.414)/(1.72)=5.831$

Step 2

The y-intercept b0 can now be calculated as:

$b_o=\bar y-b_1\bar x=37-5.831\cdot 4.2=37-24.490=12.510$

Step 3

The estimated value of y when x=34 is:

$y(34)=12.510+5.831\cdot(34)=12.510+198.254=210.764$

Step 4

At x=0, the estimated y takes the value of the y-intercept, by definition.

$y(0)=12.510+5.831\cdot(0)=12.510+0=12.510$

Step 5

The linear model becomes

$y=12.510+5.831x$

Step 6

The coefficient of determination can be calculated as:

$R^2=1-(SS_(res))/(SS_(tot))=1-(\sum(y_i-f_i))/(ns_y^2)\n\n\n\sum(y_i-f_i)=(25-24.17)^2+(33-30)^2+(34-35.83)^2+(45-41.67)^2+(48-53.33)^2\n\n\sum(y_i-f_i)=0.69+ 8.98+ 3.36+ 11.12+ 28.38=52.53\n\n\n ns_y^2=5\cdot 8.414^2=353.98\n\n\nR^2=1-(52.53)/(353.98)=1-0.15=0.85$

Who can access your credit report?a friends
b. employers
c. neighbors
d. teachers
Please select the best answer from the choices provided.
Ο Α
С В
ОС
D

Answers

This answer would be B

Answer:

B) employers

Step-by-step explanation:

EDGE 2021

Which equation could generate the curve in a graph below?

Answers

pretty sure its the 3rd one

Uhh maybe 3? I think???

Calculate|4+7π| . The absolute value of 4+7π is equal to the square root

Answers

|4 + 7π| = 4 + 7π

Absolute value means distance from 0, and the distance of 4 + 7π from 0 is 4 + 7π

Please help me put thanks

Answers

Hence, x=-2 and y=4 are the answers to the system of equations.

Why do people utilise coordinate geometry?

For the purpose of connecting algebra and geometry with the aid of line and curve graphs, coordinate geometry is necessary. Finding points on a plane is a crucial component of mathematics. It also has a number of uses in other scientific fields such dimensional geometry, calculus, and trigonometry. Use y=-2x in place of x in the first equation:

5x - 9(-2x) = -46

Simplify and find x's value:

5x + 18x = -46

23x = -46

x = -2

We can use the second equation to get y now that we know the value of x:

y = -2x = -2(-2) = 4

Learn more about coordinate geometry here:

brainly.com/question/18269861

#SPJ1

Suppose that 30% of all students who have to buy a text for a particular course want a new copy (the successes!), whereas the other 70% want a used copy. Consider randomly selecting 15 purchasers.The bookstore has 10 new copies and 10 used copies in stock.
If 15 people come in one by one to purchase this text, what is the probability that all 15 will get the type of book they want from current stock?

Answers

Answer:

The probability that all 15 will get the type of book they want from current stock is 0.4838.

Step-by-step explanation:

Denote the random variable Xas the number of students who want to buy new copy.

The probability of a student wanting to buy a new copy is, P (X) = p = 0.30.

A random sample of n = 15 students is selected.

The random variable X follows a Binomial distribution.

The probability function of a Binomial distribution is:

$P(X=x)={n\choose x}p^(x)(1-p)^(n-x);\ x=0, 1, 2, 3,...$

It is provided that the bookstore has 10 new copies and 10 used copies in stock.

All the 15 students get their desired copy, then this can happen if at most 10 want to buy new copy and at least 5 wants to buy used copy.

Compute the probability of (5 ≤ X ≤ 10) as follows:

P (5 ≤ X ≤ 10) = P (X = 5) + P (X = 6) + P (X = 7) + P (X = 8) + P (X = 9) + P (X = 10)

$={15\choose 5}(0.30)^(5)(1-0.30)^(15-5)+{15\choose 6}(0.30)^(6)(1-0.30)^(15-6)\n+{15\choose 7}(0.30)^(7)(1-0.30)^(15-7)+{15\choose 8}(0.30)^(8)(1-0.30)^(15-8)\n+{15\choose 9}(0.30)^(9)(1-0.30)^(15-9)+{15\choose 10}(0.30)^(10)(1-0.30)^(15-10)\n=0.2061+0.1472+0.0811+0.0348+0.0116+0.0030\n=0.4838$