∠1 ≅∠3 = 130º
1) Gathering the data, accordingly to what's been told we can write:
∠1 + ∠50º = 180º <em>Definition of two supplementary angles</em>
∠50 +∠3 = 180º
2) Then we can evaluate:
∠1 + ∠50º = 180º <em>Subtract ∠50º from both sides</em>
∠1 = 180º -50º
∠1 = 130º
∠50 +∠3 = 180º
∠3 = 180º-50º
∠3 = 130º
3) Hence ∠1 ≅∠3 = 130º because the definition of supplementary angles is the same.
Roughly 95% of the data lies within 2 standard deviations of the mean.
So (100% - 95%)/2 = 2.5% of the data lies within each tail.
This means roughly 2.5% of the data is in the left hand tail.
Answer:
E
Step-by-step explanation: