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Shtirlitz [24]
2 years ago
8

Brainliest to correct answer first!

Mathematics
1 answer:
Shalnov [3]2 years ago
7 0

Answer: Choice B (i)

Step-by-step explanation:

i stands for an imaginary number, and it will always be one. Even if I is in the power of 3, it still stays as an imaginary number.

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4. The annual salaries of employees in a large company are approximately
svetoff [14.1K]

a. What percent of people earn less than $40000?

Solution: Let S be the random variable of a salary of employee (in $), S ~ N(50000,20000). Then the random

variable X =−50000

20000

~N(0,1).

( < 40000) = ( <

40000 − 50000

20000 ) = ( < −0.5) = (−0.5) = 0.3085375.

Here Φ(x) denotes the cumulative distribution function of a standard normal distribution.

Answer: 31%.

b. What percent of people earn between $45000 and $65000?

Solution:

(45000 < < 65000) = (

45000 − 50000

20000 < <

65000 − 50000

20000 ) = (−0.25 < < 0.75)

= (0.75) − (−0.25) = 0.7733726 − 0.4012937 = 0.3720789.

Answer: 37%.

c. What percent of people earn more than $70000?

Solution:

( > 70000) = ( >

70000 − 50000

20000 ) = ( > 1) = 0.8413447.

Answer: 84%.

5 0
2 years ago
Maria bought 15 pencils each pencil cost .22 how much did it cost her to buy 15 pencils
Elena L [17]

Answer:

$3.30

Step-by-step explanation:

15 pencils * .22 cents. = 3 dollars and 30 cents !

5 0
3 years ago
Read 2 more answers
Type the correct answer in each box. Use numbers instead of words. The cost of cereal is proportional to the number of ounces. C
lisov135 [29]

Answer:

Step-by-step explanation:

To find the cost per ounce, divide the cost by the number of ounces. The cost is $2.72 and the number of ounces is 16, so the cost per ounce is $2.72/16 = 0.17. Multiply the cost per ounce by the amount asked to calculate for, 0.17 x 28 = $4.76

To conclude, the cost of 28 ounces of cereals is $4.76.

5 0
1 year ago
Which of the following expressions is incorrect?
iragen [17]
The third expression is wrong
3 0
3 years ago
What is |1 - 8i|?<br> Please answer this question
valina [46]

Answer:

the answer is complicated it is 5 actully

Step-by-step explanation:

the answer is 5

8 0
3 years ago
Read 2 more answers
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