Newborn babies: A study conducted by the Center for Population Economics at the University of Chicago studied the birth weights of 607 babies born in New York. The mean weight was 3310 grams with a standard deviation of 910 grams. Assume that birth weight data are approximately bell-shaped. Part 1 of 3 (a) Estimate the number of newborns whose weight was less than 4220 grams. Approximately 511T of the 607 newborns weighed less than 4220 grams. Part 2 of 3 (b) Estimate the number of newborns whose weight was greater than 1490 grams. Approximately 593 of the 607 newborns weighed more than 1490 grams. Part 3 of 3 (c) Estimate the number of newborns whose weight was between 3310 and 5130 grams. Approximately 290T of the 607 newborns weighed between 3310 and 5130 grams.

Suppose that the quarterly sales levels among health care information systems companies are approximately normally distributed with a mean of 12 million dollars and a standard deviation of 1.3 million dollars. One health care information systems company considers a quarter a "failure" if its sales level that quarter is in the bottom 20% of all quarterly sales levels. Determine the sales level (in millions of dollars) that is the cutoff between quarters that are considered "failures" by that company and quarters that are not. Carry your intermediate computations to at least four decimal places. Round your answer to one decimal place. million dollars X S

You may need to use the appropriate technology to answer this question. Data were collected on the top 1,000 financial advisers. Company A had 239 people on the list and another company, Company B, had 121 people on the list. A sample of 16 of the advisers from Company A and 10 of the advisers from Company B showed that the advisers managed many very large accounts with a large variance in the total amount of funds managed. The standard deviation of the amount managed by advisers from Company A was s₁ = $583 million. The standard deviation of the amount managed by advisers from Company B was s₂ = $484 million. Conduct a hypothesis test at a = 0.10 to determine if there is a significant difference in the population variances for the amounts managed by the two companies. What is your conclusion about the variability in the amount of funds managed by advisers from the two firms? State the null and alternative hypotheses. 2 2 H₂:0 2 Find the value of the test statistic. (Round your answer…

According to a recent report the battery life for a new line of laptop computers has a mean of 9 hours with a standard deviation of 2.4 hours.  If battery life is normally distributed what percentage of new laptops will last between 8 and 11 hours on a single charge?