Which expression represents the difference of 15 and s, increased by 4?
1 answer:
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Answer:
The number of drinks that Sarah bought was 2 and the number of candies that Sarah bought was 6
Step-by-step explanation:
Let
x ----> the number of drinks that Sarah bought.
y ----> the number of candies that Sarah bought.
we know that
she bought $35.50 worth of drinks and candies
so
-----> equation A
She bought 3 times as many candies as drinks.
so
-----> equation B
Solve the system by graphing
Remember that the solution is the intersection point both graphs
using a graphing tool
The solution is the point (2,6)
see the attached figure
therefore
The number of drinks that Sarah bought was 2 and the number of candies that Sarah bought was 6
Using the <u>normal distribution and the central limit theorem</u>, it is found that there is a 0.1635 = 16.35% probability of a sample result with 68% or fewer returns prior to the third day.
In a normal distribution with mean and standard deviation
, the z-score of a measure X is given by:
- It 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, which is the percentile of X.
- By the Central Limit Theorem, for a proportion p in a sample of size n, the sampling distribution of sample proportions has mean
and standard error
In this problem:
- Sample of 500 customers, hence
.
- Amazon believes that the proportion is of 70%, hence
The <u>mean and the standard error</u> are given by:
The probability is the <u>p-value of Z when X = 0.68</u>, hence:
By the Central Limit Theorem
has a p-value of 0.1635.
0.1635 = 16.35% probability of a sample result with 68% or fewer returns prior to the third day.
A similar problem is given at brainly.com/question/25735688