Inferring population mean from sample mean
10:03
Inferring population mean from sample mean
Feb 20, 2011
Khan AcademySal Khan
The mean height of men in the US (ages 70 - 79) is 69.5 inches and the standarddeviation is 3.0 inches. A random sample of 60 men between the ages of 70 and 79 isdrawn from this population. Find the probability that the sample mean height of thesemen is less than 70 inches0.90160.13830.11350.39110.0115
The mean height of men in the US (ages 70 - 79) is 69.5 inches and the …
6 months ago
numerade.com
The amount of time that a drive-through bank teller spends on a customer is a random variable with a mean μ=3.2 minutes and a standard deviation σ=1.6 minutes. If a random sample of 64 customers is observed, find the probability that their mean time at the teller's counter is (a) at most 2.7 minutes: (b) more than 3.5 minutes; (c) at least 3.2 minutes but less than 3.4 minutes. | Numerade
The amount of time that a drive-through bank teller spends on a cust…
Dec 17, 2021
numerade.com
8.29 The distribution of heights of a certain breed of terrier has a mean of 72 centimeters and a standard deviation of 10 centimeters, whereas the distribution of heights of a certain breed of poodle has a mean of 28 centimeters with a standard deviation of 5 centimeters. Assuming that the sample means can be measured to any degree of accuracy, find the probability that the sample mean for a random sample of heights of 64 terriers exceeds the sample mean for a random sample of heights of 100 po
8.29 The distribution of heights of a certain breed of terrier has a mean o…
Jul 31, 2022
numerade.com
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