<span>
The good answer is 9
(9:9=1 and 27:9=3)</span>
This one.
The doubly-shaded area is the solution set. The dashed line is not included.
Answer:
=376.8
Step-by-step explanation:
V=n Where V is the volume , r is the radius and h is the perpendicular height .
r = m=6
h = 10m
n=3.14
v= 3.14 * 6*6 *
=376.8
Using the normal distribution, it is found that 25.14% of the batteries will last more than 420 hours.
<h3>Normal Probability Distribution</h3>
The z-score of a measure X of a normally distributed variable with mean and standard deviation is given by:
- The z-score measures how many standard deviations the measure is above or below the mean.
- Looking at the z-score table, the p-value associated with this z-score is found, which is the percentile of X.
In this problem, we have that the mean and the standard deviation are given, respectively, by:
.
The proportion of the batteries will last more than 420 hours is <u>one subtracted by the p-value of Z when X = 420</u>, hence:
Z = 0.67
Z = 0.67 has a p-value of 0.7486.
1 - 0.7486 = 0.2514.
0.2514 = 25.14% of the batteries will last more than 420 hours.
More can be learned about the normal distribution at brainly.com/question/24663213
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