Answer:
A
Step-by-step explanation:
Answer:
The probability that a light bulb picked at random will last between 1400 and 1500
P(14 00≤X≤1500) = 0.032
Step-by-step explanation:
<u><em>Explanation:-</em></u>
Given that mean of the Population = 1000
Given that the standard deviation of the Population = 250 hours
Let 'X' be the random variable in a normal distribution
Let X = 1400
Let X = 1500
The probability that a light bulb picked at random will last between 1400 and 1500
P(x₁≤ X ≤x₂) = P(Z₁≤ Z ≤z₂)
= A( Z₂ ) -A(Z₁)
P(1400≤X≤1500) = P(1.6≤ Z ≤2)
= A(2 ) -A(1.6)
= 0.4772-0.4452
= 0.032
<u><em>Final answer:</em></u>-
The probability that a light bulb picked at random will last between 1400 and 1500
P(14 00≤X≤1500) = 0.032
2.
a. y=6x+3
b. 4x^2=(1/2)^x+1
c. |9-2x|=3
3.
a. i dont know how to answer this part
b. if you plug it into the system 19.8 does not equal 40 and 31.1 doesn't equal 38
Answer:
50 liters
Step-by-step explanation:
Amount of salt in the 35% solution + amount of salt in the 70% solution = amount of salt in the 45% solution
0.35 x + 0.70 (20) = 0.45 (x + 20)
0.35 x + 14 = 0.45 x + 9
5 = 0.1 x
x = 50