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U.S. internet users spend an average of 18.3 hours a week online. If 95% of users spend between 13.1 and 23.5 hours a week, what is the probability that a randomly selected user is online less than 15 hours a week?

0.1075

Intro Stats / AP Statistics

Chapter 6

The Normal Distribution

Section 2

Applications of the Normal Distribution

Probability Topics

Missouri State University

Piedmont College

University of St. Thomas

Boston College

Lectures

0:00

00:57

According to a report by t…

02:40

In January $2003,$ the Ame…

02:07

COMPUTERS In 1999, 73\% of…

03:02

Find the $95^{\text { th }…

03:01

Social Networking Sites A …

01:13

Some Internet service prov…

03:45

Students in an online stat…

01:55

Internet Purchases Thirty-…

02:54

Cyber Monday Shopping A su…

02:02

Americans spend an average…

02:43

According to a September 2…

05:02

Internet Viewing A researc…

09:03

The mean number of hours o…

06:23

Pew Research, in November …

03:34

The following sample data …

01:56

Home Internet Access Accor…

00:52

Find the mean, median, and…

01:01

A survey of households in …

01:59

As used in line 96, “secul…

00:42

From 1993 to 1998, the tot…

I know everybody here to solder problem number 37. In elementary statistics, I step by step approach is thinking that US Internet users spends, on average 18.3 hours week and 95% of the other spent between 13.1 and 23 point fine. Always good began about the probability that this election user, if it is selected randomly into him a lisp in less than 15 hours a week. So let's start our This is a chemical change for a moment distribution. This is sort of boots the givens they give it for and the sample is way. Know that average way we know that the average U is equal to 18 18 point. OK, so these very is 18 point. And by know that 95% off the the user's ISP in between 15 point look well okay. And 23 point 23.5. Then we can use these aliens in order to calculate that standard deviation. So every day, for example, 13.1 So 13 point supposed to be doing 15.1 supposed to be with you, minus two. But the growing by son of the needed by known then the new is Sequent through 18.3. So from here we can get that the Sunday division is equally is it too? 2.6 on the year is we want to know that will be is we send it user friendly. The probability Neitz, the time human spent is is in or equal 15. So this issue meant existing was steam in right here because this is a new music with 18.3, so 15 is smaller than it empathy. So it's assumed that is a principle team in this position. So we are trying to find the area under the good idiot under good from X sequence of teams so we can get above anything. And okay, a smaller bed 15 where X is the times been, boy and the user. So in orders to use the normal distribution tables to get this alien is there You were trying to find ways so we can first find or currently the van. And the thing is, is the central lines so that is equal to you. Suing there is equal to is a the minus you. She's edge this Sunday, the Asian. So there any way we have is and we know that the average or the mean is 18.3. And the simplification gets here from a witness to two points. So is this very is equal to you? Did one point to sit so here we can create that the value corresponding toe Executive 15 is equal to one. They weren't going to say so. Now we are ready to use the tables Here we are trying to find the knitting while going to and that way is negative. 1.27 So it's the gunpoint toe. The column is our little seven. So this rain is corresponding to the again. Under the career, win is equal to needed. Teoh 1.2 seven. So the Israeli is no 0.10 to zero. So four z Quinn tomb and oh, it's what to. And this is our example and this is the idiot under Okay, we next it's wounding

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