Answer:
Mean = 30.68
Standard deviation = 6.095
Two standard deviations above the mean = 42.87
Step-by-step explanation:
Given the following data :
21; 21; 22; 23; 24; 24; 25; 25; 28; 29; 29; 31; 32; 33; 33; 34; 35; 36; 36; 36; 36; 38; 38; 38; 40
Mean = Σ(x) / n
n = 25
Σ (X) = 767
Mean (m) = 767 / 25
Mean (m) = 30.68
Standard deviation : sqrt[Σ(x - m) / n]
Using a calculator :
Standard deviation = 6.095 ( 2 decimal places)
2 standard deviations above the mean :
Mean + 2(standard deviation)
Mean + 2(6.095)
30.68 + 12.19
30.68 + 12.19
= 42.87
Answer:
square root of 4 = 2.
Step-by-step explanation:
i'm a b0omer
Answer:
We need to earn $10,000 to buy that car.
Step-by-step explanation:
Let initial bank account balance = 0;
Suppose our income is $x.
Since 23% of income shpould be paid in taxes,
Money paid in taxes = 23/100x X
After paying taxes,
Money in our account = Income - Money paid in taxes;
Money in our account = x - 23/100x X
Money in our account = 77/100x X (equation 1)
Given,
Price of the car to be bought = $7700 (equation 2)
To be able to buy that car,
Money in account = Price of the car
From equation 1 and equation 2,
77/100x X = 7700
x= 7700 x 100/77
Therefore,
x = $10000.
Therefore
We need to earn $10000 to buy the car.
Answer:
Step-by-step explanation:
40,000= x (1+ .04)^12
the future value of the account =40,000
the amount invested at the end of each period =x because we do not know
the interest rate per period = 0.04 because 8% compounded semiannually is 4% per 6 months or written as decimals 0.04
(1+.04) because you gain interest so you add to the 100% of your money 4%
the number of periods = 12 because in 6 years we have twelve 6 months periods
x= $24,983.88
