Answer:
Answer for the question:
The Rockwell hardness of a metal is determined by impressing a hardened point into the surface of the metal and then measuring the depth of penetration of the point. Suppose the Rockwell hardness of a particular alloy is normally distributed with mean 69 and standard deviation 2.7.
a. If a specimen is acceptable only if its hardness is between 67 and 75, what is the probability that a randomly chosen specimen has an acceptable hardness?
b. If the acceptable range of hardness is (69-C, 69+C), for what value of C would 95% of all specimens have acceptable hardness?
c. If the acceptable range is as in part (a) and the hardness of each of ten randomly selected specimens is independently determined, what is the expected number of acceptable specimens among the ten?
d. What is the probability that at most eight of ten independently selected specimens have a hardness of less than 72.84(HINT Y=number among the ten specimens with hardness less than72.84 is a binomial variable; what is p?)
is given in the attachment.
Step-by-step explanation:
wheres the picture
Step-by-step explanation:
<span>The proper sequence John would use to find the measure he wants.is given as follows:
Step 1: </span><span>John drives a stake opposite the tree to establish a line between two points.
Step 2: </span><span>John uses a compass to walk away from the stake at a right angle.
Step 3: </span><span>On the path John walks until he finds a line of sight to the tree that equals 60 degrees.
Step 4: </span><span>John drives a second stake in the ground.
Step 5: </span><span>John measures the distance between the two stakes.
Step 6: </span><span>John multiplies the distance between the two stakes by 1.7 to find the distance.</span>
N+(n+1)+(n+2)+(n+3)+(n+4)+(n+5)=270
We use these terms to represent the first six consecutive integers in the sequence
Now we group like terms:
6n+15=270
Minus 15 from both sides of the equation
6n=255
n=42.5 which is not an integer
Is this a joke question?
Besides that, the 2nd number will be 43.5