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liberstina [14]
3 years ago
5

Whats 2 plus 2?////////////////////////////////////////////////

Mathematics
2 answers:
sergiy2304 [10]3 years ago
6 0

Answer:

4

Step-by-step explanation:

its like you have 2 fishes and you get two more

Mazyrski [523]3 years ago
5 0

Answer:

4

Step-by-step explanation:

When you have two question marks and add two more you have four

????

1234

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52-10=45 Your answer:​
prisoha [69]

Answer:

52 - 10 = 42

Step-by-step explanation:

5 0
3 years ago
A study of the amount of time it takes a mechanic to rebuild the transmission for a 1992 Chevrolet Cavalier shows that the mean
Dovator [93]

Answer:

B) 0.0069

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 \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}}.

For a skewed variable, the Central Limit Theorem can also be applied, as long as n is at least 30.

In this question, we have that:

\mu = 8.4, \sigma = 1.8, n = 40, s = \frac{1.8}{\sqrt{40}} = 0.2846

Find the probability that their mean rebuild time exceeds 9.1 hours.

This is 1 subtracted by the pvalue of Z when X = 9.1. So

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

By the Central Limit Theorem

Z = \frac{9.1 - 8.4}{0.2846}

Z = 2.46

Z = 2.46 has a pvalue of 0.9931

1 - 0.9931 = 0.0069

So the answer is B.

6 0
3 years ago
{1, 5, 10, 15} {1, 3, 5, 7} Which of the following shows the union of the sets?
maria [59]

Answer:

{1, 5}

Step-by-step explanation:

the union is all the values in both sets. The only shared numbers in these two sets are 1, and 5. therefore, the union of the sets is {1, 5}

Hope this helps have a great day! <3

also, pls mark brainliest!!

7 0
2 years ago
Select all the observations that are true about the scatter plot.
nikklg [1K]
Nooo please don’t put B. It’s A,C, and D
6 0
3 years ago
The critical points of a rational inequality are -1, 3, and 4. Which set of points can be tested to find a complete
Artist 52 [7]

Answer:

It's D I got it right

Step-by-step explanation:

I know

7 0
3 years ago
Read 2 more answers
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