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1 year ago

In a normal distribution, 68% of the data fall within how many standard deviations of the mean?

Mathematics

1 answer:

Ket [755]1 year ago

3 0

The following percentages of the data fall within the given numbers of standard deviation:

$\begin{gathered} 1\sigma\rightarrow68\text{ percent} \\ 2\sigma\rightarrow95.5\text{ percent} \\ 3\sigma\rightarrow99.7\text{ percent} \end{gathered}$

Therefore, 68% of the data will fall within one standard deviation.

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the altitude of A (in feet) of a plane T minutes after liftoff is given by a=3400t + 600. How many minutes after liftoff is the

____ [38]

If our equation is $a = 3400t + 600$ , and we have a target altitude of $21,000$ , we just need to plug that in for $a$ .

$21,000 = 3,400t + 600$ . Now subtract $600$ from both sides.

$20,400 = 3,400t$ . now divide both sides by $3,400$ .

$6 = t$ .

We get that our answer is at 6 minutes we get an altitude of 21,000 feet!

6 0

3 years ago

Quien me ayuda? pls!!!

posledela

Answer:

The answer is B

Step-by-step explanation:

You need to find the derivitive of the equation and ,ultiply by B!!!

4 0

3 years ago

In a sale, normal prices are reduced by 20%

deff fn [24]

So sale price= normal price-dicount
sale price=100%-20%=80%
therfor
220=80%of origonal price
80%
percent means parts out of 100
80%=80/100=8/10
220=8/10of origonal price
multiply both sdies by 10
2200=8 of origoal price
divide by 8
2200/8=275

origonal price=275

7 0

3 years ago

Two mechanics worked on a car. the first mechanic worked for 15 hours, and the second mechanic worked for 5 hours. together they

Stells [14]

Let
x----------> the first mechanic rates
y----------> the second mechanic rates

we know that
x+y=165
15x+5y=1775

using a graph tool
see the attached figure

the solution is
x=95
y=70

the answer is

the rates of the first mechanic is 95
the rates of the second mechanic is 70

4 0

3 years ago

69. A statistics instructor believes that fewer than 20% of Evergreen Valley College (EVC) students attended the opening midnigh

Oduvanchick [21]

Answer:

a. at least 20%, when in fact, it is less than 20%.

Step-by-step explanation:

Type 1 Error is to reject null hypothesis when it is actually true.

Here the null hypothesis is fewer than 20% of Evergreen Valley College (EVC) students attended the show.

In mathematics fewer than 20% means less than 20%.

So the null hypothesis is that less than 20 % students attended the show.

We have to reject this hypothesis .

We can reject this hypothesis when we assume that the % is greater than or equal to 20 %

At least 20% means greater than or equal to 20%.

So the best choice is option a.

at least 20%, when in fact, it is less than 20%.

6 0

3 years ago