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

Trades & Technology

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.

Trades & Technology

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?

Trades & Technology

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.

Trades & Technology

Concrete that has hardened but not yet gained structural strength, is referred to as _____.

a. raw b. green c. uncured d. unstable

Trades & Technology