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4 years ago

I need a hand please

Mathematics

1 answer:

bearhunter [10]4 years ago

8 0

The answer would be 2/7, because 3 and 5 are the only factors of 15. 2/7 which is about 29 percent.

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Area & Surface Area:Question 10

nlexa [21]

Answer:

Step-by-step explanation:

7 0

3 years ago

5/3 ×(− 6/7) pls answer

timama [110]

Answer:

Mixed Number Form:

-1 3/7

Step-by-step explanation:

4 0

3 years ago

. The average life of a certain type of small motor is 10 years with a standard deviation of 2 years. The manufacturer replaces

Pepsi [2]

Answer:

She should offer a guarantee of 13.76 years.

Step-by-step explanation:

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.

The average life of a certain type of small motor is 10 years with a standard deviation of 2 years.

This means that $\mu = 10, \sigma = 2$

If she is willing to replace 3% of the motors that fail, how long a guarantee (in years) should she offer?

She should offer the 100 - 3 = 97th percentile as a guarantee, so X when Z has a pvalue of 0.97, that is, X when Z = 1.88.

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

$1.88 = \frac{X - 10}{2}$

$X - 10 = 2*1.88$

$X = 13.76$

She should offer a guarantee of 13.76 years.

8 0

3 years ago

Suppose we have four integers, no two of which are congruent $\pmod 6$. Let $N$ be the product of the four integers. If $N$ is n

aalyn [17]

Answer:

Step-by-step explanation:

Given:

A, B, C, D have distinct positive values for mod 6

A (mod 6) = 1

B (mod 6) = 2

C (mod 6) = 4

D (mod 6) = 5

Each mod 6 value cannot be a zero since the product ABCD is not a multiple of 6.

Furthermore, in order that ABCD mod 6 > 0, we cannot have a residue equal to 3, else the product with a residue 2 or 4 will make the product a multiple of 6.

Thus the only positive residues can only be 1,2,4,5

A*B*C*D (mod 6) > 0 = 1*2*4*5 (mod 6) = 4

4 0

4 years ago

How do you do this ?

Amanda [17]

You have to find the percentage of calculators that are defective. to do this you do 6/900. Which equals 0.006666, you convert it to a percent by moving the decimal point 2 to the right which is 0.6666%, then you round to the nearest tenth as instructed in the question and you get 0.6%

8 0

3 years ago