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3 years ago

Help pls fast im on an test

Mathematics

1 answer:

enot [183]3 years ago

6 0

Answer:

Step-by-step explanation:

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Suppose the weights of the Boxers at this club are Normally distributed with a mean of 166 pounds and a standard deviation of 5.

lesya [120]

Answer:

0.1994 is the required probability.

Step-by-step explanation:

We are given the following information in the question:

Mean, μ = 166 pounds

Standard Deviation, σ = 5.3 pounds

Sample size, n = 20

We are given that the distribution of weights is a bell shaped distribution that is a normal distribution.

Formula:

$z_{score} = \displaystyle\frac{x-\mu}{\sigma}$

Standard error due to sampling =

$=\dfrac{\sigma}{\sqrt{n}} = \dfrac{5.3}{\sqrt{20}} = 1.1851$

P(sample of 20 boxers is more than 167 pounds)

$P( x > 167) = P( z > \displaystyle\frac{167 - 166}{1.1851}) = P(z > 0.8438)$

$= 1 - P(z \leq 0.8438)$

Calculation the value from standard normal z table, we have,

$P(x > 167) = 1 - 0.8006= 0.1994 = 19.94\%$

0.1994 is the probability that the mean weight of a random sample of 20 boxers is more than 167 pounds

3 0

3 years ago

A man drove 480 miles at an average rate of 40 mi/ hour how long did he travel?

cluponka [151]

Answer:

It took him 12 hours

Step-by-step explanation:

480 / 40=12

8 0

3 years ago

What is the solution to the equation? (-9x+5)^1/2=(3+4x)1/2

Phoenix [80]

4 0

4 years ago

I<br> Evaluate −4x+y when x=5/4 and y=1/5. Write your answer as a mixed number in simplest form.

Daniel [21]

Answer:

$-4\frac{4}{5}$

Step-by-step explanation:

-4x + y

Plug in your values for x and y

-4 (5/4) + (1/5)

-20/4 + 1/5

-5 + 1/5

= - 4 4/5

7 0

3 years ago

2) the quotient of 14 and 7

tamaranim1 [39]

Answer:

The quotient of 7 and 14 is 2..

4 0

3 years ago