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kvasek [131]
3 years ago
5

What value of t makes the following equation true? 3(t−2)=−1

Mathematics
2 answers:
USPshnik [31]3 years ago
8 0

Answer:

t=

Step-by-step explanation:

3(t-2)=-1

3t-6=-1

3t-6+6=-1+6

3t=5

t=5/3

adell [148]3 years ago
8 0

Answer:

5/3

Step-by-step explanation:

3(t - 2) = -1

3t - 6 = -1

3t = -1 + 6

3t = 5

t = 5/3 <==

lets check it..

3(5/3 - 2) = -1

3(5/3 - 6/3) = -1

3(-1/3) = -1

-3/3 = -1

-1 = -1 (correct)...it checks out

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Step-by-step explanation:

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in the unted states, the height of men are normally distributed with the mean 69 inches and standard deviation 2.8 inches. If 16
yaroslaw [1]

Answer:

Probability that their mean height is less than 68 inches is 0.0764.

Step-by-step explanation:

We are given that in the united states, the height of men are normally distributed with the mean 69 inches and standard deviation 2.8 inches.

Also, 16 men are randomly selected.

<em>Let </em>\bar X<em> = sample mean height</em>

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

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

where, \mu = population mean height = 69 inches

            \sigma = population standard deviation = 2.8 inches

            n = sample of men = 16

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.

So, probability that the mean height of 16 randomly selected men is less than 68 inches is given by = P(\bar X < 68 inches)

 P(\bar X < 68 inches) = P( \frac{\bar X-\mu}{\frac{\sigma}{\sqrt{n} } } < \frac{68-69}{\frac{2.8}{\sqrt{16} } } ) = P(Z < -1.43) = 1 - P(Z \leq 1.43)

                                                           = 1 - 0.9236 = 0.0764

<em>Now, in the z table the P(Z  x) or P(Z < x) is given. So, the above probability is calculated by looking at the value of x = 1.43 in the z table which has an area of 0.92364.</em>

Therefore, probability that their mean height is less than 68 inches is 0.0764.

3 0
3 years ago
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