What must be added to -16 to give 45
1 answer:
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Answer:
The mean of the sampling distribution is of 215 seconds and the standard deviation is 5.
Step-by-step explanation:
The Central Limit Theorem estabilishes that, for a normally distributed random variable X, with mean and standard deviation
, the sampling distribution of the sample means with size n can be approximated to a normal distribution with mean
and standard deviation
.
For a skewed variable, the Central Limit Theorem can also be applied, as long as n is at least 30.
All songs
Mean 215 seconds, standard deviation 35 seconds
Sample
49
Mean 215, standard deviation
The mean of the sampling distribution is of 215 seconds and the standard deviation is 5.
Answer:
The perimeter of the polygon is 48 cm.
Step-by-step explanation:
Given:
To find the perimeter of the polygon, we need to find the lengths of the AB, BC, CD and DA
Since, and to find the length, from circle theorem, "Two tangents from an external point to a circle are always equal in length".
From this statement we shall conclude,
The length of
The length of
The length of
The length of
Thus, the perimeter of the polygon is
Hence, the perimeter of the polygon is 48 cm.
Answer: 0.8 radians
Step-by-step explanation:
To solve this exercise you must apply the formula shown below:
Where S is the arc lenght, r is the radius of the circle and is the central angle in radians.
Solve for the central angle:
Now, when you susbtitute the value of the arc length and the radius, you obtain that the central angle is: