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MaRussiya [10]
3 years ago
8

430 randomly selected light bulbs were tested in a laboratory, 224 lasted more than 500 hours. Find a point estimate of the prop

ortion of all light bulbs that last more than 500 hours
Mathematics
1 answer:
Ray Of Light [21]3 years ago
6 0
The estimated portion of light bulbs that last more than 500 hours will be
x=∑xn=224/430=0.521=52.1%
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Complete the solution of the equation. Find the value of y when x equals 4. -7x + y = -22
xz_007 [3.2K]

-7x + y = -22

-7*4 + y = -22

y = -22 + 28

y = 6

4 0
3 years ago
9. How many ways can 6 different items be arranged in a line and how many ways can 6 different items be arranged in a circle? 1​
docker41 [41]
36 different ways; usually when it asks how many times different outcomes can pop up, all you have to do is multiply is by itself.
6 0
3 years ago
A new furnace for your small factory will cost $29,000 and a year to install, will require ongoing maintenance expenditures of $
Neporo4naja [7]

Answer:

Net present value is $61,058.

Step-by-step explanation:

Net present value is the difference between present value of cash inflows and the present value cash outflows over the period of time. NPV method is used in capital budgeting to analyze profitability of the project.

Less: initial cost is $29,000

Add: Year 1: Cost saving due to new furnace is $5,600 (2,800 oil gallons * $ 2 per gallon)

Year 2: Cost saving due to new furnace is $7,000 (2,800 oil gallons * $ 2.50 per gallon)

Year 3- 20: Cost saving due to new furnace is $8,400 (2,800 oil gallons * $ 3 per gallon)

Less : Maintenance expenditure is $1,200

The furnace will benefit for 20 years and the price per gallon will increase by $0.50 year.

The annuity factor is applied at discount factor of 6% and then present value of each cash inflow and outflow is calculated. The net present value is $61,058.

8 0
3 years ago
Use graphs and tables to find the limit and identify any vertical asymptotes of limit of 1 divided by the quantity x minus 6 as
viva [34]
By using the graphs and tables, the best and most correct answer among the choices provided from your problem about vertical asymptotes is the first choice or letter <span>a) -∞ ; x = 6. It is shown that according to the condition in the problem, the limit is negative infinity and the vertical asymptote is x = 6. I hope it has come to your help.</span>
4 0
3 years ago
I do not understand five through eight please help????????????
bogdanovich [222]
For number 5 the answer is 5/2
number 6 is 23/5
number 7 is 31/9
number 8 is 19

All you do is multiply the denominator by the whole number then the product of that you add that to the numerator and then the sum of that you just put that as your numerator and you keep the same denominator.
6 0
3 years ago
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