the mean deviation

Assume that the weights of 3,000 students at a university are normally distributed with mean 150 pounds and a standard deviation of 2.72 pounds. How many samples would you expect to find the mean between 147 and 155 pounds? => 83 or 82 or 84 or 81..

The diameter of twenty randomly selected iron bars were measured. The mean was 1.65 cm, and the standard deviation was 0.09 cm. Find the mean diameter (μ) with 99% confidence. => 1.60 < μ < 1.70 or 1.49 < μ < 1.80 or 1.59 < μ < 1.71 or 1.5..

A soft drink company claims that the mean quantity of soft drink in a tin is 300 ml with a standard deviation of 5 ml. A random sample of 65 bottles from a shipment had a mean of 296.5 ml. Is the shipment is significantly different from the standard at the 0.05 level o..

The mean life span of an electric bulb is 350 hours, with a standard deviation of 10 hours. A random sample 40 of a particular brand of electric bulbs is taken and found that their mean life span was 348 hours. State the null hypothesis( H o ) for the situation. => H o..

A survey of 139 athletes found that the mean body weight of an athlete is 261.35 pounds. The standard deviation is 2.37, find the 90% confidence interval of the population mean (μ). => 260 < μ < 262 or 261 < μ < 261.70 or 261.02 < μ < 261...

In the discrete series, when deviations are taken from actual mean, the formula ..

It has been observed that the number of telephone calls made daily in a city between 11a.m and 12 p.m have a mean of 252 and a standard deviation of 25. What is the probability that there will be more than 327 or less than 177 calls in this city between 11a.m and 12 p.m? => 0.99..

Introduction - Today graphics, tables, reasoning, estimation and prediction are playing a very important role in stating the facts in terms of figures. Statistics deals mainly in communicating facts and figures in terms of a method called statistical method. Collection, classification, tabulation, ..

The mean weight of girls in grade 12 of school X is 125 pounds, and the standard deviation is 20 pounds. If a sample of 25 girls is selected, then what is the probability that the mean of the sample will be greater than 128 pounds? Assume the variable is normally distr..

A survey asks 'How much time do you spend in front of the TV in one week? Suppose the responses are normally distributed, the mean is 10 hours and the standard deviation is 2 hours. Suppose there are 50 responses to the survey question. How many would you expect to spend between..