Plz help answer these questions I’m confused. Worth 25 points.
2 answers:
Answer:
2. -3/2
6. -5/4
8. 7/6
10. 10
Step-by-step explanation:
2. Your Que 1 shows exactly how to work problems 1 to 6. Find the difference in y-coordinates, and divide that by the difference in x-coordinates. For Que 2, that is ...
6. The vertical change in y between the marked points (left to right) is -5 grid squares. The horizontal change is +4 grid squares. Thus, the slope is ...
... (change in y)/(change in x) = -5/4
8. The slope-intercept form of the equation for a line is ...
... y = mx + b
The slope (m) is the coefficient of x. The y-intercept (b) is the constant term. Identifying slope and intercept is a matter of matching the given equation to this pattern and identifying corresponding parts.
Your equation has an x-coefficient of 7/6. That is the slope. m = 7/6.
10. See the explanation for 8. Your equation has a constant term of 10. b = 10.
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Answer:
0.5 = 50% probability that a random sample of 100 independent persons will cause an overload
Step-by-step explanation:
To solve this question, we need to understand the normal probability distribution and the central limit theorem.
Normal Probability Distribution:
Problems of normal distributions can be solved using the z-score formula.
In a set with mean and standard deviation
, the zscore 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 pvalue, we get the probability that the value of the measure is greater than X.
Central Limit Theorem
The Central Limit Theorem estabilishes that, for a normally distributed random variable X, with mean and standard deviation
, the sampling distribution of the sample means with size n can be approximated to a normal distribution with mean
and standard deviation
.
For a skewed variable, the Central Limit Theorem can also be applied, as long as n is at least 30.
For the sum of n values of a distribution, the mean is and the standard deviation is
An expert in ski lifts thinks that the weights of individuals using the lift have expected weight of 200 pounds and standard deviation of 30 pounds. 100 individuals.
This means that
If the expert is right, what is the probability that a random sample of 100 independent persons will cause an overload
Total load of more than 20,000 pounds, which is 1 subtracted by the pvalue of Z when X = 20000. So
has a pvalue of 0.5
1 - 0.5 = 0.5
0.5 = 50% probability that a random sample of 100 independent persons will cause an overload