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exis [7]
3 years ago
15

PLEASE HELP!!!!!! (answer in decimal!!!!)

Mathematics
1 answer:
Alexus [3.1K]3 years ago
8 0

Answer:

0.706....

Step-by-step explanation:

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A normally distributed set of numbers has a mean of 75 and a standard deviation of 7.97. What percentage of values lies between
lana [24]

Answer:

63% of the values lies between 70 and 85.

Step-by-step explanation:

We are given that a normally distributed set of numbers has a mean of 75 and a standard deviation of 7.97.

<em>Let X = Set of numbers</em>

The z-score probability distribution for is given by;

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

where, \mu = mean value = 75

            \sigma = standard deviation = 7.97

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, percentage of values that lies between 70 and 85 is given by = P(70 < X < 85) = P(X < 85) - P(X \leq 70)

   P(X < 85) = P( \frac{  X -\mu}{\sigma} < \frac{  85-75}{7.97} ) = P(Z < 1.25) = 0.89435  {using z table}

   P(X \leq 70) = P( \frac{  X -\mu}{\sigma} \leq \frac{  70-75}{7.97} ) = P(Z \leq -0.63) = 1 - P(Z < 0.63)

                                                 = 1 - 0.73565 = 0.26435

<em>Now, 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 = 1.25 and x = 0.63 in the z table which has an area of 0.89435 and 0.73565 respectively.</em>

Therefore, P(70 < X < 85) = 0.89435 - 0.26435 = 0.63 or 63%

<em>Hence, 63% of the values lies between 70 and 85.</em>

6 0
3 years ago
Reduce -56/-70 to lowest terms <br><br> •-2/3<br> •-4/5<br> •4/5<br> •8/10
Kaylis [27]
4/5 is the right answer.....
4 0
2 years ago
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Evaluate the expression. 4–4÷2
n200080 [17]

Answer:

2.

Step-by-step explanation:

7 0
3 years ago
Does the following infinite series converge or diverge? And does it or does it not have a sum 1/3-2/9+4/2718/81+...
Kaylis [27]

Answer:

Diverges

Step-by-step explanation:

See Image.

8 0
3 years ago
Can someone help please? this is due soon. ill give brainliest
Iteru [2.4K]
Not sure but I think it’s B
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3 years ago
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