Z = (X-Mean)/SD
z1 = (580-600)/20 = - 1 
z2 = (620-600)/20 = + 1 
According to the Empirical Rule 68-95-99.7 
Mean +/- 1*SD covers 68% of the values 
Therefore, required percent is 68%
hopes this help :) :D :)

6 0

3 years ago

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0.5401 this in scientific notation

bearhunter [10]

5.401 x -10
hope i can help, of so may i have brainliest, i want my level up

4 0

3 years ago

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Please explain your answer. Thank you!

Liula [17]

Answer:

Step-by-step explanation:

Let length of rectangle be "l"

Let width of rectangle be "w"

We know,

LENGTH is 2 MORE THAN WIDTH, we can write:

l = w + 2

Also, note the perimeter is the sum of all 4 sides of a rectangle, thus:

length + width + length + width

Now,

The perimeter is given as 72, so we can write:

l + l + w + w = 72

2l + 2w = 72

We have 2 equations that we need to solve and find the length (l).

The first equation is:

l = w + 2

Rearranging, we have:

w = l - 2

We put this into 2nd equation and find the value of l:

$2l + 2w = 72\\2l + 2(l-2) = 72\\2l+2l-4=72\\4l-4=72\\4l=76\\l=\frac{76}{4}\\l=19$

The length is 19 meters, the correct answer is C

3 0

4 years ago