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2 years ago

What two integers have a sum of zero and why

Mathematics

1 answer:

pantera1 [17]2 years ago

4 0

Answer:

The number 0 is called the additive identity because when you add it to a number, the result you get is the same number.

Step-by-step explanation:

Example : 3 + (-3) = 0

Hope this helps!! :))

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A company produces steel rods. The lengths of the steel rods are normally distributed with a mean of 259.2-cm and a standard dev

Varvara68 [4.7K]

Answer:

The probability that the average length of rods in a randomly selected bundle of steel rods is greater than 259 cm is 0.65173.

Step-by-step explanation:

We are given that a company produces steel rods. The lengths of the steel rods are normally distributed with a mean of 259.2 cm and a standard deviation of 2.1 cm. For shipment, 17 steel rods are bundled together.

Let $\bar X$ = the average length of rods in a randomly selected bundle of steel rods

The z-score probability distribution for the sample mean is given by;

Z = $\frac{\bar X-\mu}{\frac{\sigma}{\sqrt{n} } }$ ~ N(0,1)

where, $\mu$ = population mean length of rods = 259.2 cm

$\sigma$ = standard deviaton = 2.1 cm

n = sample of steel rods = 17

Now, the probability that the average length of rods in a randomly selected bundle of steel rods is greater than 259 cm is given by = P( $\bar X$ > 259 cm)

P( $\bar X$ > 259 cm) = P( $\frac{\bar X-\mu}{\frac{\sigma}{\sqrt{n} } }$ > $\frac{259-259.2}{\frac{2.1}{\sqrt{17} } }$ ) = P(Z > -0.39) = P(Z < 0.39)

= 0.65173

The above probability is calculated by looking at the value of x = 0.39 in the z table which has an area of 0.65173.

8 0

3 years ago

Solve this equation 5x+17= 42

sergey [27]

Answer:

x = 5

Step-by-step explanation:

5x + 17 = 42

5x = 25

x = 5

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2 years ago

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HELP ME!!!! I WILL GIVE YOU BRAINLIEST IF YOU GIVE ME THE ANSWER TO THIS!!!!

Sladkaya [172]

The answer is B because the mean is 131.6 and the median is 36, and obviously 131.6 is the greater value. Hope this helps! If I am wrong, someone in the comments please correct me

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2 years ago

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At me farmers market, bananas coast $0.80 per pound.At another farmers market, bananas are sold in 5-pound bags for $4.50 per ba

Vedmedyk [2.9K]

Answer:

Step-by-step explanation:

At the first place is better because

$0.8 * 5 = $ 4

$4.5 / 5 = $0.9

Is more expensive in the another place

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2 years ago

F(x) = 1/3x -2; reflection in the x-axis

san4es73 [151]

Would it be -1/3x -2?

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2 years ago

What two integers have a sum of zero and why​

What two integers have a sum of zero and why