Answer:
7.2 times
Step-by-step explanation:
There are 36 possible outcomes when rolling a die twice and adding the results. The outcomes for which the sum is 6 are:
Sum = 6: {1,5; 2,4; 3,3; 4,2; 5,1}
Therefore there is a 5 in 36 chance that the sum will be 6.
The expected number of trials to achieve that result is given by:
![E = \frac{36}{5}\\E=7.2\ times](https://tex.z-dn.net/?f=E%20%3D%20%5Cfrac%7B36%7D%7B5%7D%5C%5CE%3D7.2%5C%20times)
On average, it would take 7.2 trials to achieve a sum of 6.
Answer:
Step-by-step explanation:
Given: cos θ = -4/5 , sin x = -12/13, θ is in the third quadrant, and x is in the fourth quadrant; evaluate tan x.
-12/5
-13/5
-5/12
The least amount she must save is $190
work: 475-285 =190