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GuDViN [60]
3 years ago
13

A major television manufacturer has determined that its 44 inch screens have a mean service life that can be modeled by a normal

distribution with a mean of 6 years and a standard deviation of one-half year (6 months). What is the probability that the service life of that product is between 5 and 7 years
Mathematics
1 answer:
Neko [114]3 years ago
5 0

Answer:

P(5

And we can find this probability with thie difference:

P(-2

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

P(-2

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 heights of a population, and for this case we know the distribution for X is given by:

X \sim N(6,0.5)  

Where \mu=6 and \sigma=0.5

We are interested on this probability

P(5

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(5

And we can find this probability with thie difference:

P(-2

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

P(-2

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If 50% is 30 what is 75%​
Gemiola [76]

Answer:

50\% = 30 \\ 70\% = x \\  \\ 50\%x = 30 \times 70\% \\ x =  \frac{30 \times 70\%}{50\%}  \\ x = 42 \\ hence \: 70\% \: is \: 42

6 0
3 years ago
How will adding the value 75 affect the mean and median of the data set 1, 5, 7, 9 , 9, 10? * A. The median increases less than
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The answer is A.
Hope this helps!
3 0
3 years ago
Find the product simplify the answer 3*1/7
Pani-rosa [81]

Answer:3/7

Step-by-step explanation:

3 * 1/7 is

3 * 1 = 3

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There’s nothing to simply, as that fraction cannot be reduced

4 0
3 years ago
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kvv77 [185]

Answer:

I got it.

Step-by-step explanation:

-12a - (-15b) + (-3c)

4 0
3 years ago
12x - 5 = 8x - x + 50<br> Help please show work and check the solution
Inga [223]

Answer:

x = 11

Step-by-step explanation:

12x - 5 = 8x - x + 50 \\ 12x - 5 = 7x + 50 \\ 12x - 5 - 7x = 7x + 50 - 7x \\ 12x - 7x - 5 = 50  \\ 5x - 5 = 50 \\ 5x - 5 + 5 = 50 + 5 \\ 5x = 55 \\ x = 11

and check:

12(11) - 5 = 8(11) - (11) + 50 \\ 132 - 5 = 77 + 50 \\ 127 = 127

3 0
3 years ago
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