ISDS 2001 Chapter : Tutorial 5
15 Mar 2019
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Standard deviation / standard error for x is n: at a computer manufacturing company, the actual size of computer chips is normally distributed with a mean of 1 centimeter and a standard deviation of 0. 1 centimeter. A random sample of 12 computer chips is taken. What is the standard error for the sample mean? (0. 029: a random sample of size 35 is drawn from a normal distribution with mean 30 and variance 25. What is the probability that: the sample mean is at least 28? (0. 9911, the sample mean is at most 32? (0. 9911, the sample mean is between 29 and 32? (0. 8721) The content of a packet of chocolate drink powder is distributed normally with mean. 250 grams and standard deviation of 25 grams. 50 packets were chosen randomly, what is the probability that the: mean weight is less than 245 grams? (0. 0793, mean weight is between 245 grams and 256 grams? (0. 8761)
