Use technology or a z-score table to answer the question. the scores on a memory test are normally distributed with a mean of 100 and a standard deviation of 25. consider a group of 400 people who take the test. how many people will score 90 or less?

You are a clerk at convenience store. a customer owes 11.69 for a bag of potatoes chips. she gives you a five dollar bill. how much change should the customer receive?

The fraction of defective integrated circuits produced in a photolithography process is being studied. a random sample of 300 circuits is tested, revealing 17 defectives. (a) calculate a 95% two-sided confidence interval on the fraction of defective circuits produced by this particular tool. round the answers to 4 decimal places. less-than-or-equal-to p less-than-or-equal-to (b) calculate a 95% upper confidence bound on the fraction of defective circuits. round the answer to 4 decimal places. p less-than-or-equal-to

:24% of students in a class are girls. if there are less than 30 students in this class, how many students are there? how many girls are there?