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Nimfa-mama [501]

4 years ago

11

When Jim surveyed 5 sixth-grade students at the community skating rink, he found that only 1 out of the 5 had completed the

1 answer:

kati45 [8]4 years ago

7 0

Answer: yes its a good inference

Step-by-step explanation:

its a good inference because if you multiply 32 by 5 it makes 160 and sense its 1 of every 5 it should be one fifth you find one fifth by dividing the hole number by 5 and reverse it by multiplying it by 5.

You might be interested in

Discriminant and the number of real roots for this equation 9x2+12x+4=0

BaLLatris [955]

The discriminant is b^2-4ac
In this equation 9=a, 12=b, 4=c
Plugging into the formula
12^2-4(9)(4)=
144-324 =
-180 is the discriminant
Since the discriminant is a negative number there are no real roots

8 0

3 years ago

An adult can lose or gain two pounds of water in the course of a day. Assume that the changes in water weight are uniformly dist

Levart [38]

Answer:

Standard deviation of the weight over a day is 1.15

Step-by-step explanation:

Since it is given that water weight is uniformly distributed between -2 to 2.

So applying formula for variance of uniformly distribution as follows,

$variance=\dfrac{\left (b-a\right )^{2}}{12}$

From the given data, values of a and b is , $a=-2$ , $b=2$ ..

Substituting the values,

$variance=\dfrac{\left (2-\left (-2 \right )\right )^{2}}{12}$

Now, $-\left ( -2 \right )=2$

$variance=\dfrac{\left (2+2\right )^{2}}{12}$

$variance=\dfrac{\left (4\right )^{2}}{12}$

$variance=\dfrac{16}{12}$

Dividing the fraction by 4,

$variance=\dfrac{4}{3}$

So, the value of variance is $\dfrac{4}{3}$

The formula for standard deviation is given as,

$Standard\:deviation=\sqrt{variance}$

Substituting the value,

$Standard\:deviation=\sqrt{\dfrac{4}{3}}$

$Standard\:deviation=1.15470$

Rounding to 2 decimal places,

$Standard\:deviation=1.15$

So, the value of standard deviation is 1.15.

4 0

3 years ago

Read 2 more answers

Bert collector wants 100 birds in the budget is exactly $100 the bluebird cost $10 the green bird cost three dollars the yellow

Ghella [55]

Answer:

Step-by-20 yellow birds.50=$10.00

6 Bluebirds $10.00= $60.00

10 green birds $10= $30.00

Totaling $100 and more than one of each bird step explanation:

3 0

4 years ago

Dylan builds a circular enclosure for his dog He uses a tree as the center of the circle. He builds the fence 10.5 yards from th

pochemuha

Answer: 66 yards of fence

Step-by-step explanation:

This is a circular enclosure so the length of the fence must be the circumference of the circular enclosure.

The fence was built 10.5 yards from the centre which would mean that 10.5 yards is the radius of the circle.

The circumference will therefore be:

= 2 * Pie * radius

= 2 * 22/7 * 10.5

= 66 yards of fence

6 0

3 years ago

at maximum speed, an airplane travels 1720 miles against th wind in 5 hours. Flying with the wind, the plane can travel the same

iragen [17]

Answer:

x = 387

Step-by-step explanation:

The wind acts in the opposite direction to the plane when the time is longer.

The wind acts in the same direction as the plane when the time is shorter.

Equation

d = r*t

Givens

d = 1720
x = plane's speed
y = wind speed
t1 = 5 hours
t2 = 4 hours.

Substitution

d = (x + y) * t
1720 = (x + y) * 4
1720 = (x - y) * 5

Since the two distances are the same, you can equate the right hand sides.

(x + y) * 4 = (x - y)*5 Remove the brackets.
4x + 4y = 5x - 5y Add 5y to both sides
4x + 4y + 5y = 5x - 5y + 5y Combine all the terms.
4x + 9y = 5x Subtract 4x from both sides
9y + 4x - 4x = 5x - 4x Combine
9y = x

Now use one of the given equations with the distance

1720 = (x + y)*4 Substitute 9y for x
1720 = (9y + y) * 4 Combine
1720 = 10y * 4 Multiply the right
1720 = 40y Divide by 40
1720/40 = 40y/40 Do the division
43 = y y = wind speek
9y = x x = 9*y
9*43 = x
x = 387 miles per hour.

4 0

4 years ago