If you use FOIL to multiply these two brackets, it will lead you what is exactly written (xa+xb+ya+yb)
so it is correct
A
-4x + 7x - 6 = 6 <=>
-4x = 12 <=>
x = -3
=> y = 7(-3) - 6 <=>
y = -21 - 6 <=>
y = -27
Answer:
The missing probability is, P (X = 7) = 0.24.
Step-by-step explanation:
The complete question is:
A psychology experiment on memory was conducted which required participants to recall anywhere from 1 to 10 pieces of information. Based on many results, the (partial) probability distribution below was determined for the discrete random variable (X = number of pieces of information remembered (during a fixed time period)).
What is the missing probability P(X=7)? Your answer should include the second decimal place.
X = # information | probability:
1 | 0.0
2 | 0.02
3 | 0.04
4 | 0.07
5 | 0.15
6 | 0.18
7 | ?
8 | 0.14
9 | 0.11
10 | 0.05
Solution:
The sum of the probabilities of all events of an experiment is always 1.
Use the above theorem to compute the missing probability.
Thus, the missing probability is, P (X = 7) = 0.24.
P= 2L + 2 W = 50 P=50
W= L+ 5 Plug into equation (substitution)
2L +2 L+5 = 50
4L=50 -5
L= 45/4
L=11.25
P= 2 L + <u>(2 L +5)</u> = 50
P= 2(11.25) + 2(11.25) +5 =50
P=22.5 + 27.5
P=50 2L=22.5 and 2W= 27.5
L=11.25 W= 13.75
Number nine is 17.0 if this is with sorry