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LenKa [72]
3 years ago
11

Please help geometry homework

Mathematics
1 answer:
Darya [45]3 years ago
7 0
Where’s your worksheet?
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Suppose that a normal distribution has a mean of 20 and a standard deviation of 4. What is the z-score of 13?
Papessa [141]

Answer:

-1.75.

Step-by-step explanation:

The z-score = (n - m) / d  where n is the value (13) m = mean and d = standard deviation.

= (13 - 20) / 4

= -1.75  (answer)

5 0
2 years ago
A shipment contains 9 igneous, 7 sedimentary, and 7 metamorphic rocks. If 7 rocks are selected at random, find the probability t
yKpoI14uk [10]

Answer:

75 percent

Step-by-step explanation:

see the thing is

7 0
2 years ago
PLEASE HELP ON TIMER!
worty [1.4K]

Answer: 98 degrees

Step-by-step explanation:

6 0
3 years ago
Read 2 more answers
Your firm has a contract to make staff uniforms for a fast-food retailer. The heights of the staff are normally distributed with
FromTheMoon [43]

Answer:

a) 16%

b) 2.5%

Step-by-step explanation:

a)

The mean is 70 with standard deviation(SD) of 3 and you are asked to find out the percentage of staff that have <67(70-3 inch= mean - 1 SD) inch size, which means 1 SD below the mean (<-1 SD). Using 68-95-99.7 rule, you can know that 68% of the population is inside 1 SD range from the mean ( -1 SD to + 1 SD).

To put it on another perspective, there are 32% of the population that have < -1 SD and > +1 SD value. Assuming the distribution is symmetrical, then the value of < - 1 SD alone is 32%/2= 16%

b)

The question asks how many populations have size >76 inches, or mean + 2 SD (70+3*2 inch).

You can also solve this using 68-95-99.7 rule, but you take 95% value as the question asking for 2 SD instead.  Since 95% of population is inside 2 SD range from the mean ( -2 SD to + 2 SD), so there are 5% of population that have < -2 SD and > +2 SD value. Assuming the distribution is symmetrical, then the value of > +2 SD alone is 5%/2= 2.5%

3 0
3 years ago
Please Help With This Question?!?
posledela

Answer:

Step-by-step explanation:

negative

6 0
2 years ago
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