3 2/5 + ? = 4 how do I solve this problem with addiction of mixed numbers

Mathematics

2 answers:

lisabon 2012 [21]3 years ago

8 0

Answer:

Step-by-step explanation:

3 2/5 + ? = 4

17/5 + ? = 4

? = 4 - 17/5

? = (20 - 17)/5

? = 3/5

STALIN [3.7K]3 years ago

5 0

2/5 + 3/5 = 5/5= 1
Which means 3+1=4
The ? Is 3/5

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Using the normal distribution and the central limit theorem, it is found that the interval that contains 99.44% of the sample means for male students is (3.4, 3.6).

In a normal distribution with mean $\mu$ and standard deviation $\sigma$ , the z-score of a measure X is given by:

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

It 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, which is the percentile of X.

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In this problem:

The mean is of $\mu = 3.5$ .

The standard deviation is of $\sigma = 0.5$ .

Sample of 100, hence $n = 100, s = \frac{0.5}{\sqrt{100}} = 0.05$

The interval that contains 95.44% of the sample means for male students is between Z = -2 and Z = 2, as the subtraction of their p-values is 0.9544, hence:

Z = -2:

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