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sweet-ann [11.9K]
3 years ago
9

Write an equation to represent :P

Mathematics
1 answer:
SVEN [57.7K]3 years ago
7 0
$55+$40=95 for 1 hr

95x2=$190

so she came for 2 hrs
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The manager of a computer retails store is concerned that his suppliers have been giving him laptop computers with lower than av
34kurt

Answer:

Probability that the 50 randomly selected laptops will have a mean replacement time of 3.1 years or less is 0.0092.

Yes. The probability of this data is unlikely to have occurred by chance alone.

Step-by-step explanation:

We are given that the replacement times for the model laptop of concern are normally distributed with a mean of 3.3 years and a standard deviation of 0.6 years.

He then randomly selects records on 50 laptops sold in the past and finds that the mean replacement time is 3.1 years.

<em>Let M = sample mean replacement time</em>

The z-score probability distribution for sample mean is given by;

            Z = \frac{ M-\mu}{\frac{\sigma}{\sqrt{n} } }} }  ~ N(0,1)

where, \mu = population mean replacement time = 3.3 years

            \sigma = standard deviation = 0.6 years

            n = sample of laptops = 50

The Z-score measures how many standard deviations the measure is away from the mean. After finding the Z-score, we look at the z-score table and find the p-value (area) associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X.

Now, Probability that the 50 randomly selected laptops will have a mean replacement time of 3.1 years or less is given by = P(M \leq 3.1 years)

 P(M \leq 3.1 years) = P( \frac{ M-\mu}{\frac{\sigma}{\sqrt{n} } }} } \leq \frac{ 3.1-3.3}{\frac{0.6}{\sqrt{50} } }} } ) = P(Z \leq -2.357) = 1 - P(Z \leq 2.357)

                                                           = 1 - 0.99078 = <u>0.0092</u>  or  0.92%          

<em>So, in the z table the P(Z </em>\leq<em> x) or P(Z < x) is given. So, the above probability is calculated by looking at the value of x = 2.357 in the z table which will lie between x = 2.35 and x = 2.36 which has an area of 0.99078.</em>

Hence, the required probability is 0.0092 or 0.92%.

Now, based on the result above; <u>Yes, the computer store has been given laptops of lower than average quality</u> because the probability of this data is unlikely to have occurred by chance alone as the probability of happening the given event is very low as 0.92%.

8 0
3 years ago
PLS HELP I WILL GIVE BRAINLIEST
Montano1993 [528]

sin(8x) cos(3x) - cos(8x) sin(3x)

sin(8x - 3x) = sin(5x)

7 0
3 years ago
Ellen wants to enlarge some photographs. The photographs she has are 4 inches wide and 6 inches long. She wants the enlargements
Vilka [71]
The answer is b is it ok
3 0
3 years ago
Mathematics algebra solved<br><img src="https://tex.z-dn.net/?f=x%20%7B2%7D%20%20%2B%201%20%5Cdiv%204x4" id="TexFormula1" title=
Drupady [299]

Answer:

32x^{2}  + 1 / 16x

Step-by-step explanation:

x2+1/4x4

2x+(1/4*4x)

2x+(1/16x)

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What is the product?
V125BC [204]

Answer:

The answer I got was

Step-by-step explanation:

[7, 4, 3]

You use the matrix calculator and then select a*b

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