The standard mechanical pencil are numbered as:
A. P, P-1, P-2, P-3
B. HB, H, H-1, H-2, H-3, H-4
C. PH, PH-1, PH-2, PH-3
D. PN, PN-1, PN-2, PN-3, PN-4
Answer: A
You might also like to view...
The center-to-center distance between secant piles is generally
A) 5 to 8 ft. B) 15 to 20 ft. C) 8 to 12 ft. D) 10 to 15 ft. E) none of the above.
During a recent drought, a water utility in a certain town sampled 100 residential water bills and found that 73 of the residences had reduced their water consumption over that of the previous year.
a. Find a 95% confidence interval for the proportion of residences that reduced their water consumption. b. Find a 99% confidence interval for the proportion of residences that reduced their water consumption. c. Find the sample size needed for a 95% confidence interval to specify the proportion to within ±0.05. d. Find the sample size needed for a 99% confidence interval to specify the proportion to within ±0.05. e. Someone claims that more than 70% of residences reduced their water consumption. With what level of confidence can this statement be made? f. If 95% confidence intervals are computed for 200 towns, what is the probability that more than 192 of the confidence intervals cover the true proportions?
The substance that is used as the constant common material to measure specific gravity of solids is:
A) Air in a vacuum @ 29.9 in Hg. B) Air at standard conditions. C) Water @ standard conditions. D) Ice @ standard conditions.
Concrete that has hardened but not yet gained structural strength, is referred to as _____.
a. raw b. green c. uncured d. unstable