Answer: Mean of the sample proportion = 74.4
Standard deviation of the samnple proportion is 5.32.
Step-by-step explanation:
Given : A random sample of 120 is taken from a population of 10000.
Let n = 120
Also, from previous survey, it is believed that 62% of the population has an Instagram account.
i.e, population proportion : p = 0.62
Now , the mean of the sample proportin would be :
i.e. Mean of the sample proportion = 74.4
The standard deviation of the samnple proportion would be :
Thus , the standard deviation of the samnple proportion is 5.32.
Answer:
The 90th percentile for the life span of the Galápagos Islands giant tortoise is 119.4 years.
Step-by-step explanation:
Let <em>X</em> denote the life span of the Galápagos Islands giant tortoise.
It is provided that <em>x</em> follows a normal distribution with mean 100 years and standard deviation 15 years.
Compute the 90th percentile value as follows:
P (X < x) = 0.90
⇒ P (Z < z) = 0.90
The corresponding value of <em>z</em> is, <em>z</em> = 1.29.
Compute the value of <em>x</em> as follows:
Thus, the 90th percentile for the life span of the Galápagos Islands giant tortoise is 119.4 years.
Answer:
it should be B. welcome!!
Step-by-step explanation:
Hope this helps! feel free to clarify
Answer: A) and B)
Step-by-step explanation:
So for the first one, a closed circle means that it includes the point and the graph proceeds in the positive direction. So it will be whatever number it starts on in the x axis is less than or equal to x.
The second one you find the distance it moves each second.
You do this by distance over time d/t. Then you divide the 408 by that number.
So 264cm / 11 seconds = 24 cm/sec
Then 408cm/ 24cm per sec = 17s
