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A variable is normally distributed with mean 21 and standard deviation 7. Use your graphing calculator to find each of the following areas. Write your answers in decimal form. Round to the nearest thousandth as needed. a) Find the area to the left of 20. b) Find the area to the left of 17. c) Find the area to the right of 18.
Math. Statistics. The weights of a certain dog breed are approximately normally distributed with a mean of 51 pounds, and a standard deviation of 5.6 pounds. Use your graphing calculator to answer the following questions. Write your answers in percent form. Round your answers to the nearest tenth of a percent.
Probability. The lifespan of a calculator manufactured by a certain company has a normal distribution with a mean of 54 months and a standard deviation of 8 months. a.) If the company guarantees that any calculator that starts malfunctioning within 36 months from date of purchase will be replaced by a new one, what percentage of the calculator ...
Statistics. (a) Use a calculator with mean and standard deviation keys to calculate x1, s1, x2, and s2. (Round your answers to four decimal places.) x1 = s1 = x2 = s2 = (b) Let μ1 be the population mean for x1 and let μ2 be the population mean for x2. Find a 99% confidence interval for μ1 − μ2. (a) Use a calculator with mean and standard ...
Based on the following calculator output, determine the population standard deviation of the dataset, rounding to the nearest 100th if necessary. 1-Var-Stats 246.571428571 Σα1726 = 429622 Sx 25.947749696 ox = 24.0229482124 n = 7 minX 221 Q1 = 231 Med = 239 Qз — 256 = maxX = 299
(100, 150, 200, 250, 300} O c. 100, 200, 250, 300, 350} O d. {2, 20, 102, 80, 80} Using the rules of standard deviation, if a value is with in data is ♦ standard deviations of the mean it might be considered a new discovery or incredibly rare. standard deviation of the mean then it is 68% likely to occur. If
Math. Statistics. The standard deviation of the numbers 3, 8, 12, 17 and 25 is 7.56 correct to 2 decimal places. What happens if each of the five numbers is increased by 2? The standard deviation is multiplied by 2. The standard deviation is decreased by 2. The standard deviation is increased by 2. The standard deviation stays the same. The ...
using your calculator find the range and standard deviation, round to 2 decimal places. the table below gives the number of hours spent watching TV last week by a sample of 24 students. 25,45,77,60,46,35,48,41,34,37,83,31,66,27,85,63,25,84,87,93,20,51,46,10. The ages (in years) of a random sample of shoppers at a gaming store are shown.
Math. Statistics. (a) Use a calculator with mean and standard deviation keys to find x and s. (Round your answers to four decimal places.) (b) Compute a 90% confidence interval for the population mean u of home run percentages for all professional baseball players. Hint: If you use the Student's t distribution table, be sure to use the closest ...
Statistics. Big chickens: The weights of broilers (commercially raised chickens) are approximately normally distributed with mean 1521 dlo grams and standard deviation 166 grams. Use the TI-84 Plus calculator to answer the following. (a) What proportion of broilers weigh between 1185 and 1283 grams?