The 2 smaller triangles are similar. Thus, y is to z as x is to 4. You need 3 such ratios to find the 3 unknowns. Could you try your hand at writing 1 more ratio based upon the illustration?
Answer:
Mean or Expected Value:
μ
=
∑
x
i
n
X
x
P
(
x
)
Standard Deviation:
σ
=
√
∑
x
i
n
X
(
x
−
μ
)
2
P
(
x
)
Step-by-step explanation:
<span>-7 • (a4 - 81a2 - 162)27
-------------------------------- hope it helps
27</span>
2/5
0.4/1*10/10=4/10
4/10%2/2=2/5
