Manny has $650 in his savings
2 answers:
Answer:
Interest Manny earns after 2 years is $52
Step-by-step explanation:
Amount deposited = $650
Simple annual interest rate = 4%
To find: Interest after 2 years
We know that the formula to calculate the interest amount is
Simple interest (S.I.) =
where,
P is the initial amount deposited
r is the rate of simple interest in percentage
t is the time in years for which interest is to be calculated
Substituting the known values in the formula, we get
S.I =
= 52
Hence the interest Manny earns after 2 years is $52
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Answer:
Step-by-step explanation:
Given
Required
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Answer:
4.924 years
Step-by-step explanation:
Lets denote X the lifetime of a tv tube (In years). X has distribution , with
unknown.
We know that P(X < 4) = 0.2. Using this data, we can find the value of throught standarization.
Lets call the standarization of X. Z has distribution N(0,1), and its cummulative function,
is tabulated. The values of
can be found in the attached file.
The value q such that doesnt appear on the table. We can find it by using the symmetry of the normal density function. The opposite of q, -q must verify that
, hence -q must be equal to 0.84. Thus, q = -0.84
But this value of q should match with the number , so we have
Thus, the expected lifetime of TV tubes is 4.924 years.
I hope this works for you!