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Solution: Concrete Mix A certain type of concrete mix is
Chapter 9, Problem 13AYU(choose chapter or problem)
Problem 13AYU
Concrete Mix A certain type of concrete mix is designed to withstand 3000 pounds per square inch (psi) of pressure. The strength of concrete is measured by pouring the mix into casting cylinders 6 inches in diameter and 12 inches tall. The concrete is allowed to set up for 28 days. The concrete’s strength is then measured (in psi).The following data represent the strength of nine randomly selected casts:
3960, 4090, 3200, 3100, 2940, 3830, 4090, 4040, 3780
Compute the range and sample standard deviation for the strength of the concrete (in psi).
Questions & Answers
QUESTION:
Problem 13AYU
Concrete Mix A certain type of concrete mix is designed to withstand 3000 pounds per square inch (psi) of pressure. The strength of concrete is measured by pouring the mix into casting cylinders 6 inches in diameter and 12 inches tall. The concrete is allowed to set up for 28 days. The concrete’s strength is then measured (in psi).The following data represent the strength of nine randomly selected casts:
3960, 4090, 3200, 3100, 2940, 3830, 4090, 4040, 3780
Compute the range and sample standard deviation for the strength of the concrete (in psi).
ANSWER:
Answer :
Step 1 of 2 :
Given, A certain type of concrete mix is designed to withstand 3000 pounds per square inch (psi) of pressure. The strength of concrete is measured by pouring the mix into casting cylinders 6 inches in diameter and 12 inches tall. The concrete is allowed to set up for 28 days. The concrete’s strength is then measured (in psi).The following data represent the strength of nine randomly selected casts:
3960, 4090, 3200, 3100, 2940, 3830, 4090, 4040, 3780
Range = is the difference between lowest and highest value
= 4090 - 2940
= 1150
Step 1 of 2 :
Mean = =
= 3670
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