Divide 30 by 3 and you get 10. Divide 30 by 2 and your get 15. Add 15 to 10 and you get 25. 25 is your answer.
Answer:
I believe it is the third one but I am not sure, you can ask your teacher for help
Step-by-step explanation:
The answer should be 37
2(x+8) = 3(x-7)
distribute
2x+16 = 3x-21
Subtract 2x from both sides
2x+16-2x = 3x-21-2x
16 = x-21
Add 21 to both sides
16+21 = x-21+21
Answer:
Step-by-step explanation:
Since the the production of the polymer fiber follows a normal distribution, we would apply the formula for normal distribution which is expressed as
z = (x - µ)/σ
Where
x = measured diameter values.
µ = mean diameter
σ = standard deviation
From the information given,
µ = 30 μm
σ = 20 μm
a) The probability of a measured value greater than 80 μm is expressed as
P(x > 80) = 1 - P(x ≤ 80)
For x = 80,
z = (80 - 30)/20 = 2.5
Looking at the normal distribution table, the probability corresponding to the z score is 0.994
P(x > 80) = 1 - 0.994 = 0.006
b) the probability of a measured value between 60 and 75 μm is expressed as
P(60 ≤ x ≤ 75)
For x = 60,
z = (60 - 30)/20 = 1.5
The probability corresponding to the z score is 0.933
For x = 75,
z = (75 - 30)/20 = 2.25
The probability corresponding to the z score is 0.988
Therefore,
P(60 ≤ x ≤ 75) = 0.988 - 0.933 = 0.055