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3 years ago

A table titled hours spent studying has entries 4, 5, 9, 15, 8, 2, 20, 1, 6, 9, 10, 8, 10, 8, 1, 2.

Mathematics

2 answers:

Elena L [17]3 years ago

5 0

Answer:

Range = from the starting number(smallest #) to the largest number

Step-by-step explanation:

1-20

Sidana [21]3 years ago

5 0

Answer:

the range of value is 19.

Step-by-step explanation:

the difference between the highest and lowest value(20 and 1)

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An index that is a standardized measure used in observing infants over time is approximately normal with a mean of 90 and a stan

weqwewe [10]

Answer:

The proportion of children that have an index of at least 110 is 0.0478.

Step-by-step explanation:

The given distribution has a mean of 90 and a standard deviation of 12.

Therefore mean, $\mu$ = 90 and standard deviation, $\sigma$ = 12.

It is given to find the proportion of children having an index of at least 110.

We can take the variable to be analysed to be x = 110.

Therefore we have to find p(x < 110), which is left tailed.

Using the formula for z which is p( Z < $\frac{x - \mu}{\sigma}$ ) we get p(Z < $\frac{110 - 90}{12}$ = 1.67).

So we have to find p(Z ≥ 1.67) = 1 - p(Z < 1.67)

Using the Z - table we can calculate p(Z < 1.67) = 0.9522.

Therefore p(Z ≥ 1.67) = 1 - 0.9522 = 0.0478

Therefore the proportion of children that have an index of at least 110 is 0.0478

8 0

3 years ago

I don't get this can someone help me?

pickupchik [31]

Answer:

n=5

x= 23

p= 4

Step-by-step explanation:

What this wants us to do is find the value of the variable first, then find the measurement of the degrees.

So, for the first equation we need to make an equation.

Since the angles are vertical angles, that means they equal each other.

The equation would be.. 8n=9n-5.

Step 1- Move variable to the left hand side and change its sign

8n-9n= -5

Step 2- Collect like terms

-n= -5

Step 3- Change signs on both sides of the equation

n=5

So, now that we know what the variable is, substitute it into the equations.

8(5)= 40 9(5)-5= 40

For the second equation, the angles equal 180 degrees.

So, that would give us the equation.. 6x+19+x= 180.

Step 1- Add the common variables

(6x+x)+19= 180

7x+19= 180

Step 2- Subtract 19 from both sides.

7x+19= 180

-19 -19

7x= 161

Step 3- Divide both sides by 7

7x= 161

7 7

x= 23

So, now that we know what the variable is, substitute it into the equations.

6(23)+19= 157

157+23= 180

Finally for the last equation, they are vertical angles, so they equal each other.

So, the equation would be 5p+28= 12p.

Step 1- Move the variable to on side.

5p+28= 12p

-5p -5p

28= 12-5p

Step 2- Subtract the variables

28= 7p

Step 3- Divide by 7 to both sides.

28= 7p

7 7

p= 4

So, now that we know what the variable is, substitute it into the equations.

5(4)+28= 48

12(4)= 48

Hope this helps!! :)

5 0

3 years ago

State the domain of the function. Discrete graph defined on the set of points negative three comma negative four and negative tw

Mariana [72]

Answer:

Step-by-step explanation:

B35

4 0

3 years ago

Find an equation in standard form for the ellipse that satisfies the given conditions. Major axis length 10 on y-axis minor axis

Helen [10]

The answe might be e= 10\16

3 0

3 years ago

A flower pot has a diameter of 6 feet. What is the area of the flower pot, to the nearest whole number?

Elodia [21]

Answer:

28 ft²

Step-by-step explanation:

The area of a circle is $\pi r^2$ , where r = radius. To find the radius, we split the diameter in half.

6/2 = 3
Thus, the radius is 3.

Now, let's find the area of the circle and approximate pi to 3.14.

$3.14*3^2$
$3.14*9$
$28.26$
28.26 ≈ 28 ft²

Therefore, the answer is 28 ft².

7 0

2 years ago