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igomit [66]
3 years ago
5

(28 and 29) I really need help

Mathematics
1 answer:
scoundrel [369]3 years ago
5 0

Answer:

28 is 11/60

29 is 7/30

Step-by-step explanation:

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The distribution of the average amount of sleep per night gotten by college students is roughly bell-shaped with mean 412 minute
kirza4 [7]

Answer:

P(X

P(z

Step-by-step explanation:

Previous concepts

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".

The Z-score is "a numerical measurement used in statistics of a value's relationship to the mean (average) of a group of values, measured in terms of standard deviations from the mean".  

Solution to the problem

Let X the random variable that represent the scores of a population, and for this case we know the distribution for X is given by:

X \sim N(412,68)  

Where \mu=412 and \sigma=68

We are interested on this probability

P(X

And the best way to solve this problem is using the normal standard distribution and the z score given by:

z=\frac{x-\mu}{\sigma}

If we apply this formula to our probability we got this:

P(X

And we can find this probability using the normal standard table or excel and we got:

P(z

4 0
3 years ago
Y= -4x cos(x) -5
saw5 [17]
To be honest I do t understand this but Carlos does so contact him
3 0
3 years ago
PLS HURRY GIVING BRAINLIEST
AlexFokin [52]

Answer:

150Ft^2

Step-by-step explanation:

The area of a parallelogram is A=BH where B is base length and H is height. I'm not sure why there is information about a triangular base, maybe an illustration would help. But with the information provided, the base times  height is equal to 150 Ft^2. Check out the Kahn Academy video for a better explanation  

5 0
2 years ago
Read 2 more answers
You have the choice of logging on at one of two Internet cafés. Their posted rates are as follows: Log-On Café: $5.50 plus $0.15
erastovalidia [21]
1. 5.50 + 0.15 * 45 = 12.25

2. 4 + 0.20 * 45 = 13

So the first option is slightly better, you can save 13-12.25= $0.75.
4 0
3 years ago
If y varies directly as x, find the constant of variation if y = 12 when x = 1/3
Mashutka [201]
The constant is 36
because direct variation y/x
4 0
3 years ago
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