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Ivan
2 years ago
12

The mean number of words per minute (wpm) read by sixth graders is 89 with a variance of 625. if 96 sixth graders are randomly s

elected, what is the probability that the sample mean would be greater than 93.02 wpm? round your answer to four decimal places.
Mathematics
1 answer:
Luba_88 [7]2 years ago
6 0
The z-score of the information given is:
z=(x-μ)/σ
where
μ-mean
σ- standard deviation

from the information given:
x=93.02
μ=89
σ=√625=25
hence
z=(93.02-89)/25
z=0.1608
thus
P(X≥x)=1-0.5636=0.4364=43.64%
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Please help
nikitadnepr [17]

Answer:

The value of x is \frac{-2}{5}.

Step-by-step explanation:

Given expression is:

\frac{2}{3}(x-2)=4x

We have to solve this for x.

First we will multiply both sides of the equation by 3

3*\frac{2}{3}(x-2)=4x*3

2(x-2) = 12x

2x-4=12x

Now we will be subtracting 2x from both sides of the equation

2x-2x-4=12x-2x

-4=10x

10x=-4

Dividing both sides by 10

\frac{10x}{10}=\frac{-4}{10}\\\\x=\frac{-2}{5}

Hence,

The value of x is \frac{-2}{5}.

8 0
2 years ago
1. Jonathan bought 10lb of flour at $7.50. He had a store coupon for $0.79. What was the
Leviafan [203]

Answer:

6.71

Step-by-step explanation:

The solution should be $6.71 because when you subtract $7.50 and $0.79 you end up with $6.71.

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2 years ago
If the company has set a goal of producing 20 radios for a cost of $3,000 which statement is true?
Levart [38]

Answer:idk sorry

Step-by-step explanation:

5 0
2 years ago
Read 2 more answers
Match the expressions 21/25 60% 13/20 84% 2/5 75% 65% 3/4 3/5
katrin [286]

Answer:

21/25 ---> 84%

13/20 ---> 65%

3/5 ---> 60%

3/4 --->75%

2/5 ---> 40%

8 0
3 years ago
Write any two necessary condition for collinearity. ​
Zolol [24]

<u>Collinear points</u>: Three points A, B and C are said to be collinear if they lie on the same straight line.

There points A, B and C will be collinear if AB + BC = AC as is clear from the adjoining figure.

In general, three points A, B and C are <u>collinear if the sum of the lengths of any two line segments among AB, BC and CA is equal to the length of the remaining line segment</u>, that is, either AB + BC = AC or AC +CB = AB or BA + AC = BC.

In other words,

<u>There points A, B and C are collinear if:</u>

(i) AB + BC = AC i.e.,

Or, (ii) AB + AC = BC i.e. ,

Or, AC + BC = AB i.e.,

6 0
2 years ago
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