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Mashutka [201]
3 years ago
7

A.US phone numbers traditionally do not start with a zero or a one, otherwise there are no other restrictions, so how many 7 dig

it phone numbers are possible?
B.Some cities have now required you to dial area codes first. For example in Chicago we either dial 773 or 312, so now how many possible Chicago Phone numbers are there?

C.Why have cities and suburbs have added on these area codes in recent years?
Mathematics
1 answer:
algol [13]3 years ago
7 0
Number of ways of choosing the first digit = 8 ways
Number of ways of choosing the rest of the digits = 10^6
Therefore, 8 x 10^6 7-digit phone numbers are possible.


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<h3>What is Normal Distribution?</h3>

The normal distribution, also known as the Gaussian distribution, is a symmetric probability distribution about the mean, indicating that data near the mean occur more frequently than data distant from the mean. The normal distribution will show as a bell curve on a graph.

Given that the candy produced by a company has a sugar level that is normally distributed with a mean of 16.1 grams and a standard deviation of 0.9 grams. Therefore, the maximum and the minimum weight of the candy can be,

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Hence, It is out of control as one of these data points is more than 3 standard deviations from the mean.

Learn more about Normal Distribution here:

brainly.com/question/15103234

#SPJ2

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