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3 years ago

Which number is divisible by 3 and 5 a. 130 b. 325 c. 4113 d. 2040

1 answer:

8 0

A number that is divisible by 5 is one that ends with either a 5 or 0. To find a number that is divisible by 3 add up the digits and if they are divisible by 3, the number also is. That rules c out because it doesn't end with a 5 or 0. 130 and 325 won't work because they are not divisible by 3. The answer would be 2040.

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The life of a semiconductor laser at a constant power is normally distributed with a mean of 7,000 hours and a standard deviatio

Scrat [10]

This question not incomplete

Complete Question

The life of a semiconductor laser at a constant power is normally distributed with a mean of 7,000 hours and a standard deviation of 600 hours. If three lasers are used in a product and they are assumed to fail independently, the probability that all three are still operating after 7,000 hours is closest to? Assuming percentile = 95%

Answer:

0.125

Step-by-step explanation:

Assuming for 95%

z score for 95th percentile = 1.645

We find the Probability using z table.

P(z = 1.645) = P( x ≤ 7000)

= P(x<Z) = 0.95

After 7000 hours = P > 7000

= 1 - P(x < 7000)

= 1 - 0.95

= 0.05

If three lasers are used in a product and they are assumed to fail independently, the probability that all three are still operating after 7,000 hours is calculated as:

(P > 7000)³

(0.05)³ = 0.125

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3 years ago

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BlackZzzverrR [31]

Answer:

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Step-by-step explanation:

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3 years ago

On a scale drawing 7 inches represents 10 miles. How much inches would represents 60 miles

Sergeeva-Olga [200]

Answer:

3.802e+6 miles

Step-by-step explanation:

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3 years ago

Solve for h<br> -8 < -4h + 20

Vladimir [108]

Answer:

h < 7

Step-by-step explanation:

-8 < -4h + 20

4h < 28 / : 4

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3 years ago

At the parents evening the ratio of mums to dads was 3:2. Out of 500 appointments how many were with mums?

guajiro [1.7K]

Answer:

300

Step-by-step explanation:

Sum the parts of the ratio : 3 + 2 = 5 parts

Divide the number of appointments by 5 to find the value of one part of the ratio, that is

$\frac{500}{5}$ = 100 ← value of 1 part of the ratio

The mums consisted of 3 parts, hence

3 × 100 = 300 ← appointments with mums

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3 years ago