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It is the highest grade of proof coin
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What is the 68-95-99.7 rule and could you demonstrate on these problems the mean of 70 and a standard deviation of 15 less than 55 less than 40 less than 85 less than 100 greater than 85?
The rule applies to the normal distribution. For any normal distribution, 68% of the observations lie within 1 standard deviation (SD) either side of the mean that is, between (mean - SD) and (mean + SD); 95% of the observations lie between (mean - 2*SD) and (mean + 2*SD); 99.7% between (mean - 3*SD) and (mean + 3*SD). To find the probability that a normally distributed random variable, with mean = m and SD = s, you calculate its z-score = (X - m)/s and look up the relevant probability value in tables. In doing this, you may have to use the symmetry of the normal distribution or the probability of complementary events (or both). This will depend on what exactly is tabulated. Mean 70, SD = 15 Pr[X < 55] = Pr[Z < (55 - 70)/15] = Pr[Z < -1] = 0.5*(1-0.68) = 0.5*0.32 = 0.16 Pr[X < 40] = Pr[Z < (40 - 70)/15] = Pr[Z < -2] = 0.5*(1-0.95) = 0.5*0.05 = 0.025 Pr[X < 85] = Pr[Z < (85 - 70)/15] = Pr[Z < 1] = 1 - 0.16 = 0.84 Pr[X < 100] = Pr[Z < (100 - 70)/15] = Pr[Z < 2] = 1 - 0.025 = 0.975 Pr[X > 85] = 1 - Pr[X < 85] = 1 - 0.84 = 0.16
What does the term PR mean in coins?
PR is used in terms of grading coins to designate that the coin is proof. For example, a perfect proof coin would be graded as PR-70. A nearly perfect proof coin might be graded PR-68 or PR-69, etc.
What does PR mean in the medical field?
pr
What is the value of a 1973 PR-70 penny?
$0.50-$1.00
What does ANACS mean for a coin?
This is a third party grading service. They will grade your coins for a charge depending on when and how many you submit to be graded. Once they have graded them they will most likely put them in a case. These are then refereed as "slabs". See below for the ANACS homepage.
Is Puerto Rico flat?
No. More than 70% of PR is mountain.
What does a 1934 Washington Quarter double die obverse graded by ANACS MS63 die4 mean?
Well, first off it is a Washington Quarter dated 1934, it is in mint state condition. Coins are graded on a scale from 1-70 with 1 being nearly recognizable and 70 being perfectly flawless. Mint state means the coin has no evidence of circulation, however, it might have scratches from hitting other coins in a bag or a roll. Doubled die obverse means that there was a mistake when the master dies were made and if you look closely parts of the legend are on there twice. Die 4 is the designation of the particular doubled die, certain dies might have slightly different doubling. ANACS means that it was graded by ANACS.
What does pr mean for coin?
PR is a grading system used for proof coins
How much is 2009 P Lincoln S 1 Bicentennial MS 70?
8-8-11>>> To date, no reliable data is available for a MS-70 (Perfect) 2009 Lincoln cent. Apparently a few 4 coin sets graded MS-70 by ANACS have sold for about $45.00.
What does pr70 mean in coin language?
PR stands for "proof," which is a specific strike type where the detail is extra clean and at least some of the surface is almost mirror-like. Then the 70 is out of a 70 point scale, so the coin with that grade is flawless.
What does PR mean?
PR stands for Public Relations. If you are referring to a geographical location, it could stand for Puerto Rico.
What does the medical abbreviation PR mean?
pr in medical terms stands for "per rectum," or a drug inserted into the rectum.
