What is 30,000 expressed in scientific notation?

Mathematics

2 answers:

Troyanec [42]3 years ago

6 0

It’s b !!!!!!!!!!!!!!!!!!!!!!!!!

4vir4ik [10]3 years ago

3 0

Answer:

Step-by-step explanation:

Hope this helps : )

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Helppppp plz people!!!

vesna_86 [32]

Answer:

Step-by-step explanation:

x^2/y

Let x=10 and y=5

10^2/5

100/5

3 0

3 years ago

Jean works for the government and was conducting a survey to determine the income levels of a number of different neighborhoods

Brrunno [24]

Answer:

0.0418 = 4.18% probability that the average income level in the neighborhoods was less than $38,000.

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 $\mu$ and standard deviation $\sigma$ , the zscore of a measure X is given by:

$Z = \frac{X - \mu}{\sigma}$

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 $\mu$ and standard deviation $\sigma$ , the sampling distribution of the sample means with size n can be approximated to a normal distribution with mean $\mu$ and standard deviation $s = \frac{\sigma}{\sqrt{n}}$ .