I need help with this please

Mathematics

2 answers:

lesantik [10]3 years ago

4 0

2 rational numbers are C. 2.777 and D. -7/3

a rational number is any number that can be expressed as the quotient or fraction p/q of two integers

as you know 0.7777 (7 repeat) = 7/9
so 2.777(7 repeat) = 2 7/9

pychu [463]3 years ago

4 0

A rational number is any number that can be expressed as the quotient or fraction of two integers. so i think all of them are rational numbers except B.

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Which rule explains why these triangles are congruent?

Naddika [18.5K]

A= angle
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2 years ago

The time taken to assemble a laptop computer in a certain plant is a random variable having a normal distribution of 20 hours an

ludmilkaskok [199]

Answer:

a) 40.13% probability that a laptop computer can be assembled at this plant in a period of time of less than 19.5 hours.

b) 34.13% probability that a laptop computer can be assembled at this plant in a period of time between 20 hours and 22 hours.

Step-by-step explanation:

When the distribution is normal, we use 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.

In this question:

$\mu = 20, \sigma = 2$