Rod is a drummer who purchases his drumsticks online. When practicing with the newest pair, he notices they feel heavier than us
1 answer:
Answer: 0.0080
Step-by-step explanation:
Given : The manufacturer's website states that the average weight of each stick is oz with a standard deviation of
oz.
We assume the weight of the drumsticks is normally distributed.
Using formula , the z-value corresponds x=2.66 will be :-
By using the standard normal distribution table for z, we get
P-value =
Hence, the probability of the stick's weight being 2.66 oz or greater=0.0080
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ANSWER
Find out the how much fluid should be drained and replaced with pure antifreeze so that the new mixture is 60% antifreeze .
To proof
let us assume that the fluid should be drained and replaced with pure antifreeze be x .
As given
A radiator contains 10 quarts of fluid, 30% of which is antifreeze.
Now write 30% in the decimal form
Now write 60% in the decimal form
After drained and replaced the fluid with pure antifreeze than the quantity becomes = ( 10 - x )
The quantity of antifreeze is
The fluid should be drained and replaced with pure antifreeze so that the new mixture is 60% antifreeze .
than the equation becomes
solyving
100x +300 - 30x = 600
70x = 300
x = 4.28 quarts (approx)
Hence 4.28 quarts (approx) fluid should be drained and replaced with pure antifreeze so that the new mixture is 60% antifreeze .
Therefore the option (c.) is correct .