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The Dowers need to make 5 pies for 15 people.
Step-by-step explanation:
Given,
1 person = 3 slices of pie
15 persons = 15*3 = 45 slices of pie
It is also given that;
9 slices of pie = 1 whole pie
1 slice of pie =
45 slices of pie =
45 slices of pie = 5 whole pies
The Dowers need to make 5 pies for 15 people.
Keywords: multiplication, division
Learn more about multiplication at:
#LearnwithBrainly
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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<span>(Decimal: 217.5)
</span>
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Then is
~ Hope this helps