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arsen [322]
3 years ago
6

A particular telephone number is used to receive both voice calls and fax messages. Suppose that 25% of the incoming calls invol

ve fax messages, and consider a sample of 25 incoming calls. What is the probability that
a. At most 6 of the calls involve a fax message?
b. Exactly 6 of the calls involve a fax message?
c. At least 6 of the calls involve a fax message?
d. More than 6 of the calls involve a fax message?
e. What is the expected number of calls among the 25 that involve a fax message?
f. What is the standard deviation of the number among the 25 calls that involve a fax message?
g. What is the probability that the number of calls among the 25 that involve a fax transmission exceeds the expected number by more than 2 standard deviations?
Mathematics
1 answer:
Andre45 [30]3 years ago
6 0

Answer:

b

Step-by-step explanation:

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(3x−9x)+(12+8)
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Hiroshi has 4 engines and 18 box cars. Find the ratio of engines to box cars. Write the ratio as a fraction in simplest form.
lyudmila [28]
To write a ratio as a fraction, we simply take the first number in the ratio and make it the numerator while taking the second number in the ratio and making it the denominator.

Because we want the ratio of engines to box cars, our ratio should be:

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When we substitute in our respective values, we get:

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To simplify this ratio, we have to find the GCF, or greatest common factor of the numerator and the denominator, which in this case is 2. To simplify, we divide both the numerator and the denominator by the GCF, as follows:

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2/9

Therefore, your answer is 2/9.

Hope this helps!
4 0
3 years ago
I need help please hurry.
Anarel [89]

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