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djverab [1.8K]
3 years ago
9

A random sample of size 25 from a normal population has the mean = 47.5 and the standard deviation s = 8.4. does this informatio

n tend to support or refuse the claim that the mean of the population is = 42.1
Mathematics
1 answer:
Ksenya-84 [330]3 years ago
8 0
What were your given answer choices
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Can you please answer this qiestion for me.
Bess [88]
A=1/(2s) * (v²-u²)




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8 0
3 years ago
Raquel builds a model train that has 4 equal-sized rail cars. Each rail car has a passenger section and a cargo section. The car
Butoxors [25]

Answer:8

Step-by-step explanation:

48/4 = 12

12-4 = 8

3 0
3 years ago
Which proportion can you use to find the value of a?
Ugo [173]

<u>Given</u>:

The given triangle is a similar triangle.

The length of the hypotenuse is 18 units.

The length of the leg is a.

The length of the part of the hypotenuse is 16 units.

We need to determine the proportion used to find the value of a.

<u>Proportion to find the value of a:</u>

We shall find the proportion to determine the value of a using the geometric mean leg rule.

Applying the leg rule, we have;

$\frac{\text { hypotenuse }}{\text { leg }}=\frac{\text { leg }}{\text { part }}$

Substituting the values of hypotenuse, leg and part, we get;

\frac{18}{a}=\frac{a}{16}

Thus, the proportion used to find the value of a is \frac{18}{a}=\frac{a}{16}

Hence, Option D is the correct answer.

6 0
3 years ago
Simplify an expression for the perimeter of the rectangle. Please Helpp
lorasvet [3.4K]
Answer:
16x+16

Explanation:
The perimeter is all of the sides added up. On a rectangle, only 2 sides are needed to know the perimeter because measurements are equal on both sides.

1) Write equation
2*5 + 2(8x+3)
2) Distributive property and multiply
10 + 16x + 6
3) Combine like terms
16x+16
6 0
3 years ago
What is the median of the following set? {5, 2, 9, 7, 4}<br><br> A: 5<br> B: 7<br> C: 8<br> D:9
hram777 [196]

A. 5

(2,4,5,7,9)

5 is in the middle between 4 and 7.

8 0
3 years ago
Read 2 more answers
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