The "rule of 72" says that the doubling time in years is approximately 72 divided by the interest rate in percent. To make the money grow by a factor of 4 requires that it double twice, so will take twice as long as the period to double once.
2×72/11.3 ≈ 12.7 . . . . years
_____
The "rule of 72" is an approximation. The actual quadrupling time for this interest rate and compounding is about 12.6 years. (The actual product of doubling time and nominal interest rate is about 71.25.)
Answer:
The probability of a bulb lasting for between 480 and 526 hours=0.74454
Step-by-step explanation:
We are given that
Standard deviation of the lifetime,
hours
Mean, 
hours
We have to find the probability of a bulb lasting for between 480 and 526 hours.
Hence, the probability of a bulb lasting for between 480 and 526 hours=0.74454
Because the formula for the area of a rectangle is length times width, all you have to do is multiply 15 by 15 and it should get you 225 as your answer
Answer:
the 2nd and 4th i think
Step-by-step explanation:
Ana: 0.15(46) = 6.9 pages per day
Hillary: 0.11(72) = 7.92 pages per day
Roger: 0.12(68) = 8.16 pages per day
Juan: 0.14 (69) = 9.66 pages per day
Ans•
