Piper deposited $734.62 in a savings account that earns 2.6% simple interest. What is Piper’s account balance after seven years?
2 answers:
Answer:
Balance in the saving account after 7 years is $ 868.32
Step-by-step explanation:
Given:
Amount deposited in account, P = $ 734.62
Rate of interest , R = 2.6%
Time, T = 7 years
To find: Amount in account after 7 years.
Formula of Simple interest, SI =
Amount, A = SI + P = 734.62 + 133.70 = $ 868.32
Therefore, Balance in the saving account after 7 years is $ 868.32
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When the person is less than 18 years old, out of 265 persons, 20 has job and 245 do not have job.
The probability is defined as .
Consider the first column only.
The probability that a randomly selected person surveyed has job is
Answer:
a) Var[z] = 1600
D[z] = 40
b) Var[z] = 2304
D[z] = 48
c) Var[z] = 80
D[z] = 8.94
d) Var[z] = 80
D[z] = 8.94
e) Var[z] = 320
D[z] = 17.88
Step-by-step explanation:
In general
V([x+y] = V[x] + V[y] +2Cov[xy]
how in this problem Cov[XY] = 0, then
V[x+y] = V[x] + V[y]
Also we must use this properti of the variance
V[ax+b] = V[x]
and remember that
standard desviation =
a) z = 35-10x
Var[z] = Var[x] = 100*16 = 1600
D[z] = = 40
b) z = 12x -5
Var[z] = Var[x] = 144*16 = 2304
D[z] = = 48
c) z = x + y
Var[z] = Var[x+y] = Var[x] + Var[y] = 16 + 64 = 80
D[z] = = 8.94
d) z = x - y
Var[z] = Var[x-y] = Var[x] + Var[y] = 16 + 64 = 80
D[z] = = 8.94
e) z = -2x + 2y
Var[z] = 4Var[x] + 4Var[y] = 4*16 + 4*64 = 320
D[z] = = 17.88