Answer:
Step-by-step explanation:
Answer:
Where and
We select a sample size of n =8. Since the distribution for X is normal then we know that the distribution for the sample mean is given by:
And the standard error would be:
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".
Solution to the problem
Let X the random variable that represent the compressive strength of concrete of a population, and for this case we know the distribution for X is given by:
Where and
We select a sample size of n =8. Since the distribution for X is normal then we know that the distribution for the sample mean is given by:
And the standard error would be:
Answer:
2h3-r5
Step-by-step explanation:
first 3-2=5
then 2h3-r=2h3-r5
finally 2h3-r5
Answer:
Please check the explanation.
Step-by-step explanation:
Given
The angle Ф = 42°
The hypotenuse = 15 cm
To determine
The length AB = ?
Using the trigonometric ratio
cos Ф = adjacent / hypotenuse
In our case:
- The adjacent to the angle Ф = 42° is the side AB
so substituting Ф = 42°, adjacent = AB, hypotenuse 15 in the trigonometric ratio
cos Ф = adjacent / hypotenuse
cos 42° = AB / 15
AB = 15 × cos 42°
AB = 11.14 cm
Therefore, the length of the side AB = 11.14 cm
36 - (-20) = 56
SO the number that should be added to -20 to get the answer of 36 is 56.
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