In order to find the speed Jesse travels in knots, you need to find his unit rate, or miles per hour. Setting up a fraction and dividing will give you how many miles her traveled per hour:

$\frac{miles}{hour}=\frac{15}{2.5}=\frac{6}{1}or6mph$

Since Jesse traveld at 6mph, you can set up a proportion (equivalent ratios) using the ratio of 1 knot to 1.2 miles per hour to find the number of knots in 6mph:

$\frac{1.2}{1}=\frac{6}{x}$ where x = the number of knots

cross-multiply and divide: 1.2x = 6 or x = 5 knots

5 0

4 years ago

The mean of the scores obtained by a class of students on a physics test is 42. The standard deviation is 8%. Students have to s

NemiM [27]

The correct answer is:
16%.

Explanation: 
We use a z-score to answer this question.
The formula for a z-score is:
z= $\frac{x-mue}{sigma}$ ,
where mue is the mean and sigma is the standard deviation.

Using our information, we have:
z= $\frac{50-42}{8} = \frac{8}{8} = 1$ .

Using a z-table, we see that the area to the left of, or less than, this score is 0.8413. We want to know how many students scored more than this, so we subtract from 1:
1-0.8413=0.1587, which rounds to 16%.

7 0

3 years ago

Read 2 more answers

Help..? ill give you a lot of points

eduard

Answer:

Thx

Step-by-step explanation:

Yes

8 0

3 years ago

Read 2 more answers