Answer:
the required number of samples to contain the population mean = 136
Step-by-step explanation:
From the Empirical rule, If a data is normally distributed, then about 68% of the population lies within one standard deviation from mean.
Now, if we suppose that the mean of a normally distributed population is 300, and 200 simple random samples are drawn from the population. i.e. μ = 300
And;
Number of simple random samples: n = 200
Thus, by implication, we would expect about 68% of 200 samples confidence intervals to contain the population mean .
Hence,
Required number of samples = 68% of 200
This gives ;
0.68 x 200 = 136
Thus , the required number of samples = 136
Answer:
Hi there!
Your answer is;
There are 50 bacteria after 3 hours
Step-by-step explanation:
After three hours, with a rate of 20% an hour, 60% should have died
20% of 125 is?
100% is 125
/100
1% is 1.25
×60
60% is 75
125-75= 50
Hope this helps
Answer:
D
Step-by-step explanation:
They have different slopes but same Y intercepts so there is ONE SOLUTION.
We will see that the solution in the given interval is: x = 0.349 radians.
<h3>How to solve equations with the variable in the argument of a cosine?</h3>
We want to solve:
cos(3*x) = 1/2
Here we must use the inverse cosine function, Acos(x). Remember that:
cos(Acos(x)) = Acos(cos(x)) = x.
If we apply that in both sides, we get:
Acos( cos(3x) ) = Acos(1/2)
3*x = Acos(1/2)
x = Acos(1/2)/3 = 0.349
So x is equal to 0.349 radians, which belongs to the given interval.
If you want to learn more about trigonometry, you can read:
brainly.com/question/8120556
When it is greater than 9.
Example
15
x 5
——-
5x5 is 25, so you would leave 5 and carry the 2
2
15
x. 5
——-
5
