Answer:
1:2 all you have to do is simplify
Answer:
0.0228 = 2.28% probability one of these light bulbs burns out in under two years.
Step-by-step explanation:
Normal Probability Distribution:
Problems of normal distributions can be solved using the z-score formula.
In a set with mean and standard deviation , the z-score of a measure X is given by:
The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the p-value, we get the probability that the value of the measure is greater than X.
Mean of 3.5 years and a standard deviation of .75 years.
This means that
What is the probability one of these light bulbs burns out in under two years?
This is the p-value of Z when X = 2. So
has a p-value of 0.0228
0.0228 = 2.28% probability one of these light bulbs burns out in under two years.
Answer:
110.5π
Step-by-step explanation:
The formula for the area of a circle is π r ²
R stands for radius. So, the radius is 10.5, you have to square it meaning 10.5 * 10.5.
110.5 and now you multiply by π so the answer is 110.5π
Hope this helps !!
-Ketifa