Write a linear system to represent the situation below be sure to define your variable. The n out sells their duble duble burger for $3.50 each and fries for $1.50 each. ron got lunch for him and his freainds one day and bought 9 total items for $23.50 how many duble duble and how many fries did ron buy?
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1) a researcher is studying a population of bats in which 16% of the population has a certain trait. the researcher wants sampling distribution with a standard deviation that is less than 2%. which sample sizes could the researcher use? select all that apply : a)n=200 b) n=300 c) n=400 d) n=500 2) from a normal distribution population, a simple random sample of size 38 is taken. the mean of the sample is 82 and the standard deviation of the sample is 4. what is the 90% confidence interval for the population mean? round to the nearest tenth ( [1], 83.1)