How to find mean, variance and standard deviation of each data set of 4,6,7,7,5,1,2,3

Mathematics

1 answer:

Sholpan [36]3 years ago

8 0

Answer:

search it up

Step-by-step explanation:

add up all the numbers, then divide by how many numbers there are. In other words it is the sum divided by the count.

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Help please... dont answer if u dont know bc this is for a grade

Sloan [31]

Step-by-step explanation:

If you can get 3 shirts for $24 then that means that each shirt was $8. With that being said, 8 multiplied by 7 equals 56 so you would pay $56 for 7 shirts.

3 0

4 years ago

The opening of the tunnel can be modeled by the graph of the equation y=-0.18x^2+4.4x-12 where x and y are measured in feet. Fin

Molodets [167]

1. To find the vertex of a parabolla whose equation is written in the standard form, you must apply the following proccedure:

2. You have:

y=-0.18x²+4.4x-12

a=-0.18
b=4.4

3. You must apply the following formula:

x=-b/2a
x=-4.4/2(-0.18)
x=-4.4/-0.36
x=12.22

4. When you susbtitute x=12.22 into the equation y=-0.18x²+4.4x-12, you obtain:

y=-0.18x²+4.4x-12
y=-0.18(12.22)²+4.4(12.22)-12
 y=14.88 feet

5. The answer is: The maximum height of the tunnel is 14.88 feet

5 0

3 years ago

Give the equation of the line perpendicular to y +7= -2(x - 6) through the point (6,-3)

lilavasa [31]

Note: this answer assumes the equation of the line can be put in slope-intercept form.

Answer:

$y + 3 = \frac{1}{2}(x-6)$

Step-by-step explanation:

1) First, find the slope of y + 7 = -2 (x - 6). We can see that it's already in point-slope form, or $y-y_1 = m (x-x_1)$ format. Remember that the number in place of the $m$ is the slope. Therefore, -2 is the slope of that equation.

What we need is the slope that is perpendicular to that, though. So, find the opposite reciprocal of -2. To do this, change its sign, convert it into a fraction ( $-\frac{2}{1}$ ), and flip its numerators and denominators. Therefore, the perpendicular slope would be $\frac{1}{2}$ .

2) Now that we have a slope and a point the line passes through, we can write an equation using the point-slope formula, $y-y_1 = m (x-x_1)$ . In order to write an equation, the $x_1$ , $y_1$ , and $m$ have to be substitute for with real values.

The $m$ represents the slope. We already calculated that in the last step, so put $\frac{1}{2}$ in place of the $m$ . The $x_1$ and $y_1$ represent the x and y values of a point the line passes through. We know that the line has to pass through (6, -3), so substitute 6 for $x_1$ and -3 for $y_1$ :

$y - (-3) = \frac{1}{2}(x -(6))\\y + 3 = \frac{1}{2}(x - 6)$