What is 100/5 in simplest form? btw i already know the answer

Nnnnneeedd 1.find the residual if you know the actual number is 5.2 and the predicted value is 4.8

2.5 milligrams is equivalent to how many grams

Recall that the owner of a local health food store recently started a new ad campaign to attract more business and wants to know if average daily sales have increased. historically average daily sales were approximately $2,700. the upper bound of the 95% range of likely sample means for this one-sided test is approximately $2,843.44. if the owner took a random sample of forty-five days and found that daily average sales were now $2,984, what can she conclude at the 95% confidence level?