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4 years ago

10

I'LL GIVE U BRAINLY IF U ANSWER CORRECTLY Willie runs 5 miles in 20 minutes. If Willie runs at the same rate, how many miles can

he run in 28 minutes?

2 answers:

Greeley [361]4 years ago

7 0

Willie will run seven miles in 28 minutes. I think I’m right!(:

elena55 [62]4 years ago

6 0

Answer:

Willie will run 7 miles in 28 minutes.

Step-by-step explanation:

You might be interested in

Cost of 5 pens is RS 10 what is the cost of one pen

zhannawk [14.2K]

Answer:

Rs 2

Step-by-step explanation:

5 pen =Rs 10

1 pen = 10÷2

=Rs 2

8 0

3 years ago

A technician compares repair costs for two types of microwave ovens (type I and type II). He believes that the repair cost for t

Margaret [11]

Answer:

There is no enough evidence that the repair cost for type I ovens is greater than the repair cost for type II ovens.

Step-by-step explanation:

We have to perform a hypothesis test on the difference of two means.

Type I ovens:

- Sample mean: 70.15

- Sample standard deviation: 20.62

- Sample size: 43

Type II ovens:

- Sample mean: 65.36

- Sample standard deviation: 22.21

- Sample size: 57

Step 1. The claim is that the repair cost for type I ovens (μ1) is greater than the repair cost for type II ovens (μ2). The null and alternative hypothesis are:

$H_0: \mu_1-\mu_2=0\\\\H_a: \mu_1-\mu_2>0$

Step 2.

The difference between the sample means is:

$M_d=\bar x_1-\bar x_2=70.15-65.36=4.76$

The standard error of the difference between means is:

$s_{M_d}=\sqrt{\frac{s_1^2}{n_1}+ \frac{s_2^2}{n_2}}=\sqrt{\frac{20.62^2}{43}+ \frac{22.21^2}{57}}=\sqrt{ 9.89 +8.65}=\sqrt{18.54}\\\\s_{M_d}=4.3$

The degrees of freedom are:

$df=n_1+n_2-2=43+57-2=98$

The t-statistic is

$t=\frac{M_d-(\mu_1-\mu_2)}{s_{M_d}}=\frac{4.76-0}{4.3}=1.11$

Step 3. The critical value for a right tail test with significance level of 0.05 and 98 degrees of freedom is t=1.66.

Then, if the test statistic is higher than 1.66, the effect is significant and the null hypothesis is rejected (rejection region).

If not, the null hypothesis is not rejected (acceptance region).

Step 4. The t-statistic is below the critical value, so the null hypothesis is not rejected.

There is no enough evidence that the repair cost for type I ovens is greater than the repair cost for type II ovens.

3 0

3 years ago

Mrs. Smith washed 2 5 of her laundry. Her son washed 1 3 of it. Who washed most of the laundry? How much of the laundry still ne

Tju [1.3M]

Answer:

a) The person who washed the most of the laundry is Mrs Smith

b) 4/15 of the laundry is left to wash

Step-by-step explanation:

Mrs. Smith washed 2/5 of her laundry. Her son washed 1/3 of it.

a) Who washed most of the laundry?

We convert the fraction of laundry each person washed to decimal

Mrs Smith = 2/5 = 0.4

Her son = 1/3 = 0.333

Therefore, the person who washed the most of the laundry is Mrs Smith

b) How much of the laundry still needs to be washed?

Let us total laundry = 1

=1 - ( 2/5 + 1/3)

Lowest Common Denominator is 15

=1- (3 × 2 + 5 × 1/15)

= 1 - (6 +5/15)

=1 - 11/15

= 4/15

8 0

3 years ago

The Great Pyramid at Giza is a square-based pyramid with height 146 meters and a base that measures 230 meters on each side. Wha

s2008m [1.1K]

Answer:

The Volume of the Great pyramid will be "2586810 m³". A further solution is provided below.

<u>Given</u>:

Sides of length,
$s = 230m$
Height,

$h = 146.7m$
According to the formula,
The Volume (V) will be:
$= \frac{1}{3} s^{2} h$
By substituting the values, we get
$= \frac{1}{3} (230)^{2} * 146.7$
$= \frac{1}{3} *520900 *146.7$
$=\frac{1}{3} * 7760430$
$= \frac{7760430}{3}$
$= 2586810m^{3}$
Thus the above is the correct solution.

Learn more about the volume of pyramid here:
brainly.com/question/15923072

7 0

2 years ago

I need to know how many classes Nathan is taking

kaheart [24]

Well how much does one notebook and one binder cost each

5 0

4 years ago