Answer:
![Var(X) = E(X^2) -[E(X)]^2 = 4.97 -(1.61)^2 =2.3779](https://tex.z-dn.net/?f=%20Var%28X%29%20%3D%20E%28X%5E2%29%20-%5BE%28X%29%5D%5E2%20%3D%204.97%20-%281.61%29%5E2%20%3D2.3779)
And the deviation would be:
Step-by-step explanation:
For this case we have the following distribution given:
X 0 1 2 3 4 5 6
P(X) 0.3 0.25 0.2 0.12 0.07 0.04 0.02
For this case we need to find first the expected value given by:
And replacing we got:
Now we can find the second moment given by:
And replacing we got:
And the variance would be given by:
And the deviation would be:
Answer:
x = 6 and x = -6
Step-by-step explanation:
Answer:
the answer for your question is b
Step-by-step explanation:
Okay, so let's represent the people as letters.
Erick= e
Tyson=t
Lane=l
They sold 90 tickets for the school banquet altogether. This means that e+t+l equals 90. Now since you know how much Erick and Tyson sold, this would mean you can replace your letters (variables) with numbers in your equation, like so:
e+t+l=90
38+24+l=90 (l remains a letter because we don't know how many he sold.)
Now add 38 and 24 to get 62.
62+l=90
To find l, we have to subtract 62 from 90.
62+l=90
-62 -62
--------------------
0+l= 28
l=28 The answer is 28.
Answer:
8 weekend hours can now be purchased.
<em>Note: The prior information required is:</em>
<em>You purchase 26 "parking hours" that you can use over the next month to park your food truck at the fair. Weekday hours cost $2/hour and weekend hours cost $10/hour.</em>
Step-by-step explanation:
Initial cost of weekday hours = $2/ hour
Since the cost of the weekday hours is tripled, new cost = $2/ hour × 3 = $6/ hour
Total week hours purchased = 26 hours
Let the number of weekend hours be x; number of weekday hours will be 26 - x
Since the budget remains the same, therefore, the total cost of weekday parking hours and weekend parking hours will be equal to $220as expressed below;
(26 - x) × $6 + $10 × x = $220
$10x - $6x + $156 = $220
$4x = $(220 -156)
x = 64/4
x = 8 hours
Therefore, 8 weekend hours can now be purchased
