The standard deviation of test scores on a certain achievement test is 10.5 . A random sample of 90 scores on this test had a mean of 72.1 . Based on this sample, find a 90% confidence interval for the true mean of all scores. What is the lower limit of the 90% confidence interval?

2.83941151 would be the answer you're looking for! : )

rick has $1400 and sally has $1500

step-by-step explanation:

to find amount of money rick has after 10 years :

principal = $1000 , time = 10 years , rate = 4% annually

to find amount of money sally has after 10 years :

her friend gives to pay her $50 per year, therefore money she has after 10 years = 50 × 10 = $500

also, sally gets $1000 after 10 years,

therefore, total amount of money sally has after 10 years = 500 + 1000 = $1500

so, after 10 years : rick has $1400 and sally has $1500