4. A biologist determined that a sample of bacteria hawed every day of an experiment. If there were 8 grams of bacteria at the beginning of the study, predict how many grams will be left after 3.5 days. Round to the nearest hundredth.

If a coin is flipped 225 times and the number of Hs is 75. Compute the proportion of Hs. Round to three places.

Calculate the proportion of the 100 samples that had at least five people own a dog. Round your answer to four decimal places. population is unknown p= .5967 n= 100

A quality control process finds 36.6 defects for every 6,100 units of production. What percent of the production is defective?

In a recent year, the Better Business Bureau settled 73% of complaints they received. You have been hired by the Bureau to investigate complaints this year involving computer stores. You plan to select a random sample of complaints to estimate the proportion of complaints the Bureau is able to settle. Assume the population proportion of complaints settled for the computer stores is 0.73, as mentioned above. Suppose your sample size is 113. DO NOT USE THE EXCEL FORMULA. CALCULATE BY HAND OR WITH A CALCULATOR. 1. What is the probability that the sample proportion will be within 4 percent of the population proportion?

Suppose that the result of a public opinion poll shows that just 10% of people would be willing to give up their cell phones for 1 week in exchange for $100. How many people would need to be surveyed in order to have a margin of error of ±2%?

The control department of a light bulb manufacturer randomly picks 4400 light bulbs from the production lot every week. The records show that, when there is no malfunction, the defect rate in the manufacturing process (due to imperfections in the material used) is 1% . When 1.5% or more of the light bulbs in the sample of 4400 are defective, the control unit calls repair technicians for service.   Answer the following. (If necessary, consult a list of formulas.) (a)Find the mean of p , where p is the proportion of defective light bulbs in a sample of 4400 when there is no malfunction.   (b)Find the standard deviation of p .   (c)Compute an approximation for P≥p0.015 , which is the probability that the service technicians will be called even though the system is functioning properly. Round your answer to four decimal places.

A hospital report indicates 25% of its patients had an MRI in January. If 1,060 patients were hospitalized in January, how many had an MRI?

On May 13 research-ers at Spirit Lake tagged 420 fish. When they returned afew weeks later, their sample of 500 fish contained 9 thatwere tagged. Give an approximation of the fish popula-tion in Spirit Lake to the nearest hundred.