Percent of red lights last between 2.5 and 3.5 minutes is 95.44% .
<u>Step-by-step explanation:</u>
Step 1: Sketch the curve.
The probability that 2.5<X<3.5 is equal to the blue area under the curve.
Step 2:
Since μ=3 and σ=0.25 we have:
P ( 2.5 < X < 3.5 ) =P ( 2.5−3 < X−μ < 3.5−3 )
⇒ P ( (2.5−3)/0.25 < (X−μ)/σ < (3.5−3)/0.25)
Since, Z = (x−μ)/σ , (2.5−3)/0.25 = −2 and (3.5−3)/0.25 = 2 we have:
P ( 2.5<X<3.5 )=P ( −2<Z<2 )
Step 3: Use the standard normal table to conclude that:
P ( −2<Z<2 )=0.9544
Percent of red lights last between 2.5 and 3.5 minutes is 
% .
This would be the solution for this problem:
88 = 2.52x + 1.61[transpose 1.61 to the other side]
88 - 1.61 = 2.52x[subtract 1.61 from 88]
86.39 = 2.52x[divide both sides by 2.52 to get the value of x]
86.39/2.52 = x
34.28 = x
The answer would be C.
Answer:
Step-by-step explanation:
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Answer:
<u>9 straps for $10.25</u>
Step-by-step explanation:
<u>Price rate</u>
- 9 straps for $10.25 = 10.25/9 = $1.14 per strap
- 30 straps for $66 = 66/30 = $2.20 per strap
<u>Better buy</u>
- <u>9 straps for $10.25</u>
- Less cost per strap
- better buy
The 3rd option, it's a reflection
