472.5 it's a pryamind or triangular pyramid. so 9x15x7/2
Answer: 78
Step-by-step explanation:
- [6 (2) (4)] + [5 (2) (3) ]
- The first bracket, 6*2* = 12, 12 * 4 = 48
- The second bracket, 5*2 = 10, 10 * 3 = 30
- Add the answers of both brackets. 48 + 30 = 78
Answer:
Option A.
Step-by-step explanation:
The given expression is
where,
.
We need to find the expression which is equivalent to the given expression.
The given expression can be rewritten as
Therefore, the correct option is A.
Answer:
The probability that Albert's sample of 64 will have a mean between 13.5 and 16.5 minutes is 0.9973.
Step-by-step explanation:
Previous concepts
Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".
The Z-score is "a numerical measurement used in statistics of a value's relationship to the mean (average) of a group of values, measured in terms of standard deviations from the mean".
Let X the random variable that represent interest on this case, and for this case we know the distribution for X is given by:
And let
represent the sample mean, the distribution for the sample mean is given by:
On this case 
Solution to the problem
We are interested on this probability
If we apply the Z score formula to our probability we got this:
And we can find this probability on this way:
And in order to find these probabilities we can find tables for the normal standard distribution, excel or a calculator.
The probability that Albert's sample of 64 will have a mean between 13.5 and 16.5 minutes is 0.9973.
Levant will receive about 9 american dollars when he exchanges his pesos.
According to this question, 1 american dollar is worth about 11 pesos. In order to find that, you need to divide 3000/270 which gives you around 11. In order to find out how many dollars he will receive for his pesos, you need to divide 100 by 11 which gives you about 9 dollars.