Answer:
A
Step-by-step explanation:
Answer:
If 4 fish are randomly selected, what is the probability that the mean weight will be between 9.6 and 15.6 lb? Round your answer to four decimal places.
This question is incomplete, the complete question is;
Assume the random variable x is normally distributed with mean p = 80 and standard deviation σ = 4.
Find the indicated probability. P(67 < x < 72)
(Round to four decimal places as needed.)
Answer:
the indicated is 0.0222
Step-by-step explanation:
Given the data in the question;
mean μ = 80
standard deviation σ = 4
p ⇒ P ( x -μ / σ )
so
P(67 < x < 72) ⇒ P( 67-80 / 4 ) < P( x -μ / σ ) < P( 72-80 / 4 )
P(67 < x < 72) ⇒ P( -13 / 4 ) < P( x -μ / σ ) < P( -8 / 4 )
P(67 < x < 72) ⇒ P( -13 / 4 < z < -8 / 4 )
P(67 < x < 72) ⇒ P( -3.25 < z < -2 )
⇒ P( z < -2 ) - P( z < -3.25)
Now from z table;
⇒ 0.02275 - 0.00058
P(67 < x < 72) ⇒ 0.02217 ≈ 0.0222 { four decimal places }
Therefore, the indicated is 0.0222
Answer: 36 cakes
Step-by-step explanation:
There are 4 bakers in this kitchen and they can each bake a cake in 20 minutes.
This means that the number of cakes baked in 20 minutes is 4 cakes.
3 hours in minutes is:
= 3 * 60
= 180 minutes
The number of 20 minute periods in 3 hours is therefore:
= 180/20.
= 9
If 4 cakes are baked in 20 minutes, the number of cakes in 180 is:
= 4 * 9
= 36 cakes
