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nirvana33 [79]
3 years ago
11

Pls someone help me

Mathematics
1 answer:
Lelu [443]3 years ago
7 0

Answer:

C

Step-by-step explanation:

Starting at zero, it went back 2/5 to negative 2/5.  Then it went forward 4/5 to positive 2/5, which is the answer.

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Step-by-step explanation:

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3 years ago
Only two full boxes and a box that was 75% full. Create a written expression
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Answer:

2( 100%) +75%

Step-by-step explanation:

a full box will literally be 100%, so two full boxes will be 2 × a full ie 100%, 'and' a box ie 75% full is addition '+'

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3 years ago
Researchers at a pharmaceutical company have found that the effective time duration of a safe dosage of pain relief drug is norm
FrozenT [24]

Answer:

a) P(1

b) P(X

Step-by-step explanation:

1) 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".  

2) Part a

Let X the random variable that represent the duration of a safe dosage of pain relief drug, and for this case we know the distribution for X is given by:

X \sim N(1.5,0.8)  

Where \mu=1.5 and \sigma=0.8

We are interested on this probability

P(1

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(1

And we can find this probability on this way:

P(-0.625

And in order to find these probabilities we can find tables for the normal standard distribution, excel or a calculator.  

P(-0.625

3) Part b

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 on this way:

P(z

6 0
3 years ago
Five out of 35 books are red. write the ratio of red books to total books in THREE different forms.
Serga [27]

Answer:

1:7, 1/7, 1 to 7

Step-by-step explanation:

5/35 = 1/7

5 0
3 years ago
Read 2 more answers
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