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3 years ago

15

This question is based on the following circle graph. The graph represents the results of a survey in which 400 people were aske

d to identify the TV channel on which they preferred to watch the evening news.
5. How many more people preferred WWCN than WANR?

A. 236
B. 68
C. 76
D. 164

2 answers:

oee [108]3 years ago

8 0

The answer is C. 76 - Good luck.

Sophie [7]3 years ago

7 0

I'd be able to figure this out if I could see the graph.

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Customers arrive at a checkout counter in a department store according to a Poisson distribution at an average of seven per hour

jasenka [17]

Answer:

a) $P(X\leq 3) =0.0009119+0.00638+0.0223+0.0521=0.0818$

b) $P(X \geq 2) = 1-P(X$

c) $P(X=5) =\frac{e^{-7} 7^5}{5!}=0.128$

Step-by-step explanation:

Let X the random variable that represent the number of customers that arrive in a given hour. We know that $X \sim Poisson(\lambda)$

The probability mass function for the random variable is given by:

$f(x)=\frac{e^{-\lambda} \lambda^x}{x!} , x=0,1,2,3,4,...$

And f(x)=0 for other case.

For this case we have $\lambda= 7 \frac{customers}{hour}$

Part a

No more than 3 means:

$P(X\leq 3) = P(X=0) +P(X=1) +P(X=2) +P(X=3)$

And if we find the individual probabilites we got:

$P(X=0) =\frac{e^{-7} 7^0}{0!}=0.0009119$

$P(X=1) =\frac{e^{-7} 7^1}{1!}=0.00638$

$P(X=2) =\frac{e^{-7} 7^2}{2!}=0.0223$

$P(X=3) =\frac{e^{-7} 7^3}{3!}=0.0521$

So then if we replace we got:

$P(X\leq 3) =0.0009119+0.00638+0.0223+0.0521=0.0818$

Part b

We want the probability that at least two so we can do this:

$P(X \geq 2) = 1-P(X$

The last step by the complement rule.

$P(X=0) =\frac{e^{-7} 7^0}{0!}=0.0009119$

$P(X=1) =\frac{e^{-7} 7^1}{1!}=0.00638$

$P(X \geq 2) = 1-P(X$

Part c

$P(X=5) =\frac{e^{-7} 7^5}{5!}=0.128$

6 0

3 years ago

Conrad savings Bank has $50 overdraft fee. On Friday, Mr. McQuire despoited his paycheck of $468.92 for a total account balance

s2008m [1.1K]

Answer:

- 505.11

Step-by-step explanation:

Balance $ 712.34, minus check $1,267.45 = Total: 555.11 minus $50 overdraft fee.

Total $ - 505.11

4 0

3 years ago

A shoe store is selling a pair of shoes for $60 that has been discounted by

kondaur [170]

Answer:

$75

Step-by-step explanation:

25% of 60 is 15 so 60 + 15 is 75

Hope this helps!!

4 0

3 years ago

The stem-and-leaf plot shows the test scores for a chemistry class.

earnstyle [38]

12 I know because I just took the quiz

6 0

3 years ago

Read 2 more answers

Select the procedure that can be used to show the converse of the Pythagorean theorem using side lengths chosen from 6 feet, 8 f

zhannawk [14.2K]

<h3>Answer: Choice A</h3>

========================================================

Explanation:

The left side $6^2+8^2$ simplifies to $100$ since $6^2+8^2 = 36+64 = 100$

The right side is also 100 because $10^2 = 100$

So $6^2+8^2 = 10^2$ is a true equation because both sides are the same number.

Therefore, a triangle with sides 6,8,10 is a right triangle. The hypotenuse 10 is the longest side opposite the 90 degree angle. In other words, the 90 degree angle is between the sides 6 ft and 8 ft.

So this is why choice A is the final answer.

-----------

Choice B is false because the inequality $8^2+10^2 < 11^2$ becomes $164 < 121$ which is also false. Even if that inequality was true, we can't use it to form a right triangle. We need both sides to be equal.

Choice C is false because we need to have both sides equal to the same number. We need to have $a^2+b^2 = c^2$ to be true if we want a right triangle with sides a,b,c.

Choice D is false because of the phrasing "Draw any two of the sides with a right angle between them". The 90 degree angle must go between the 6 and the 8, and nowhere else.

5 0

2 years ago