Ami and her friends went for a dance lesson. It cost $242 before taxes. Tax and gratuity added 23% in additional charges. Ami calculates this as $55.66 in additional charges. Is this reasonable? Explain.

Rockwell hardness of pins of a certain type is known to have a mean value of 50 and a standard deviation of 1.1. (round your answers to four decimal places.) (a) if the distribution is normal, what is the probability that the sample mean hardness for a random sample of 8 pins is at least 51?

Asurvey of 45 teens found that they spent an average of 25.6 hours per week in front of a screen (television, computer, tablet, phone, based on the survey’s sample mean, which value could be the population mean? 2.3 hours 27.4 hours 75.3 hours 41.5 hours

When 142 is added to a number the result is 64 more then 3 times the number. option 35 37 39 41