A boat travels 300.4 kilometers in 11 hours (with a constant speed) how much time will it take traveling 240 kilometers
2 answers:
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Answer:
The probability that the mean salary offer is of X or less is the p-value of , in which
is the mean salary for the population,
is the standard deviation for the population and n is the size of the sample.
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 z-score 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 p-value, we get the probability that the value of the measure is greater than X.
Central Limit Theorem
The Central Limit Theorem establishes 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.
Z-score with the Central Limit Theorem:
Z-is given by:
What is the probability that the mean salary offer for these students is X or less?
The probability that the mean salary offer is of X or less is the p-value of , in which
is the mean salary for the population,
is the standard deviation for the population and n is the size of the sample.