PLEASE HELP, ILL GIVE BRAINLIEST! SIMPLE MATHS.
2 answers:
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Answer:
0% probability that the sample mean would have been as high or higher than 3.1 if the company’s claims were true.
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 normally distributed samples are 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 random variable X, with mean and standard deviation
, a large sample size can be approximated to a normal distribution with mean
and standard deviation
In this problem, we have that:
What is the approximate probability that the sample mean would have been as high or higher than 3.1 if the company’s claims were true?
This is 1 subtracted by the pvalue of Z when X = 3.1. So
By the Central Limit Theorem
has a pvalue of 1.
1 - 1 = 0
0% probability that the sample mean would have been as high or higher than 3.1 if the company’s claims were true.
Answer:
Isabel's bee rounds to 0.8 inches and Pablo's bee round to 0.5 inches..
Step-by-step explanation:
Look at the attached picture.
The students in Mr. Bhatia's class measure the length of four bees.
If we round the lengths to the nearest tenth we get:
Isabel’s bee rounds to 0.8 inches
Pablo’s bee rounds to 0.5 inches
Wendi’s bee rounds to 0.6 inches
Brett’s bee rounds to 0.7 inches
This shows that Isabel's bee rounds to 0.8 inches and Pablo's bee round to 0.5 inches..
Answer:
D prefer romance over poetry 2:1
Step-by-step explanation:
Poetry is 20%
Romance is 40%