The weight X of a lion in the wild has a normal distribution with mean 345 pounds and a standard deviation of 75 pounds. What proportion (i.e., probability) of the lion is between 200 and 500 pounds? Use the Z-score table!
The weight X of a lion in the wild has a normal distribution with mean 345...
The weight X of a lion in the wild has a normal distribution with mean 345 pounds and a standard deviation of 75 pounds. What proportion (i.e., probability) of the lion is between 200 and 500 pounds? Use the Z-score table!
2) Suppose the weight of a newborn baby follows a normal distribution with a mean of 3500 grams and a standard deviation of 600 grams. a. What is the probability that the weight of a randomly selected newborn exceeds 4000g? b. For a random sample of 36 newborns, what is the probability that their mean weight is less than 3450g? 3) Suppose that 5% of American adults are vegetarian. Find the probability that in a random sample of 500 American...
= X- 4) A normal distribution has mean u = 65 and a population standard deviation o= 20. Find and interpret the z - Score for x = 64. u a) The z - score for x = 64 is 64-65 b) Interpret these results. (Explain): 5) A sample size 28 will be drawn from a population with mean 120 and standard deviation 21. a) Is it appropriate to use the normal distribution to find probabilities for x? yes or...
9. (Normal distribution.) Birth weight of babies delivered at term can be mode a normal distribution with mean p = 200 ounces, and standard deviation o = 20 our Using this model, find: a. The percent of bables delivered at term that weigh between 200 ounces and 216 Ounces b. The percent of bables delivered at term that weigh more than 216 ounces. 10. (Coin Tossing. You shake up 100 pennies in a jar and empty them on a table....
1) a normal distribution has a mean of 84 and standard deviation of 6 . find the z score corresponding to an x value of 76 2) a normal distribution has a mean of 55 and standard deviation of 2.7 . find the z score corresponding to an x value of 62
The distribution of weight measurements of adult women in Neverland is approximately Normal with mean 166 pounds and standard deviation 20 pounds. What percentage of the population is between 1SD and 2SD below the mean? (2p)
What proportion of a normal distribution is located between each of the following Z-score boundaries? a. z= -0.50 and z= +0.50 b. z=-0.90 and z= +0.90 c. z=-1.50 and z= 1.50 For a normal distribution with a mean of μ = 80 and a standard deviation of σ= 20, find the proportion of the population corresponding to each of the following. a. Scores greater than 85. b. Scores less than 100. c. Scores between 70 and 90. IQ test scores are standardized to produce a normal distribution with...
1.Assume that x has a normal distribution with the specified mean and standard deviation. Find the indicated probability. (Round your answer to four decimal places.) μ = 101; σ = 16 P(x ≥ 120) = 2.Suppose X ~ N(5, 9). What is the z-score of x = 5? (Enter an exact number as an integer, fraction, or decimal.) z =
0.In a normal distribution, plus and minus 2 standard deviations from the mean will include about what percent of the observations? A) 50% B) 99.7% C) 95% D)68% 21. What is the area under the normal curve between z -0.0 and z-2.0 A) 1.0000 B) 0.7408 C) 0.1359 D) 0.4770 22. Which of the following is NOT a characteristic of the normal probability distribution? A) Positively-skewed B) Bell-shaped C) Symmetrical D) Mean Mode and median are all equal 23. A...
a random variable X has a normal distribution with a mean of 17 ans standard deviation of 3.5 what is the z score for a value of 21.2