Help me pls<br> I can’t figure this out

- A rectangular pool has an area of 140 square feet. If the length of the

Alik [6]

Answer:

8.75 feet

Step-by-step explanation:

Use the area formula, A = lw, where l is the length and w is the width

Plug in the area and length, and solve for w:

A = lw

140 = 16w

8.75 = w

So, the width is 8.75 feet

7 0

3 years ago

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Assume that the number of customers who arrive at a water ice stand follows the Poisson distribution with an average rate of 6.4

Nady [450]

Answer:

18.88% probability that three or four customers will arrive during the next 30 minutes

Step-by-step explanation:

In a Poisson distribution, the probability that X represents the number of successes of a random variable is given by the following formula:

$P(X = x) = \frac{e^{-\mu}*\mu^{x}}{(x)!}$

In which

x is the number of sucesses

e = 2.71828 is the Euler number

$\mu$ is the mean in the given time interval.

Average rate of 6.4 per 30 minutes.

This means that $\mu = 6.4$

What is the probability that three or four customers will arrive during the next 30 minutes?

$P = P(X = 3) + P(X = 4)$

$P(X = x) = \frac{e^{-\mu}*\mu^{x}}{(x)!}$

$P(X = 3) = \frac{e^{-6.4}*(6.4)^{3}}{(3)!} = 0.0726$

$P(X = 4) = \frac{e^{-6.4}*(6.4)^{4}}{(4)!} = 0.1162$

$P = P(X = 3) + P(X = 4) = 0.0726 + 0.1162 = 0.1888$

18.88% probability that three or four customers will arrive during the next 30 minutes

4 0

4 years ago

2. The scale drawing of a playground is 4.7 cm wide and 6.2 cm long. The playground is 15 m wide. How long is the playground?

larisa86 [58]

Answer:

A scale drawing of a playground is 8 inches wide by 11 inches long. The actual playground ... The scale of a map says that 6 cm represents 15 km. What distance on ... car in centimeters. The car is 4.4 meters long and 1.4 meters tall. ... 10 Qs. Scale Drawings. 7.4k plays · 15 Qs. Scaled Copies and Scale Factor. 13.3k plays.

Step-by-step explanation:

Find an object that has a length dimension (length, width or height) of 1 mm. ... d 6.2 m (cm) ... 15 Which unit of length (mm, cm, m or km) would be most suitable for ... diagram and show all the measurements you found, including the units. ... the perimeter of each shape by using a ruler to measure each side to the nearest.

4 0

3 years ago

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(GIVING BRAINLYST) 1(Multiple Choice Worth 2 points) (15.01 LC) Which number sequence follows the rule subtract 15 starting from

KatRina [158]

D

Step-by-step explanation:

The correct answer is option D, which is 105, 90, 75, 60, 45.

5 0

1 year ago

The charitable foundation for a large metropolitan hospital is conducting a study to characterize its donor base. In the past, m

pentagon [3]

Answer:

Step-by-step explanation:

a) We would set up the hypothesis test. This is a test of a single population mean since we are dealing with mean

For the null hypothesis,

H0: µ equal to 100000

For the alternative hypothesis,

H1: µ greater than 100000

This is a right tailed test

Since the population standard deviation is nit given, the distribution is a student's t.

Since n = 200

Degrees of freedom, df = n - 1 = 200 - 1 = 199

t = (x - µ)/(s/√n)

Where

x = sample mean = 103157

µ = population mean = 100000

s = samples standard deviation = 27498

t = (103157 - 100000)/(27498/√200) = 1.62

We would determine the p value using the t test calculator.

p = 0.053

Alpha = 10% = 0.1

Since alpha, 0.1 > than the p value, 0.053, then

b) At the 10% significant level, the p-value/statistics is 0.053, so we should not reject the null hypothesis.

c) Hence, we may conclude that the average has not increased and the probability that our conclusion is correct is at least 90 percent.

8 0

3 years ago

Help me pls I can’t figure this out