A city is evaluating a proposal to build a parking lot. Data on the number of parked cars per day was collected for 30 days. For the proposal to be approved the city council needs to have evidence that the average number of cars parked in parking lots per day is more than 570. From the sample, the average number of cars parked per day was calculated to be 590.33 with a standard deviation of 52.062. A statistical analysis is done based on the collected data. Use this information to answer questions 1-8.

Air is to be cooled in the evaporator section of a refrigerator by passing it over a bank of 0.8-cm-outer-diameter and 0.4-m-long tubes inside which the refrigerant is evaporating at -20°c. air approaches the tube bank in the normal direction at 0°c and 1 atm with a mean velocity of 4 m/s. the tubes are arranged in-line with longitudinal and transverse pitches of sl- st 1.5 cm. there are 30 rows in the flow direction with 15 tubes in each row. determine (a) the refrigeration capacity of this system and (b) pressure drop across the tube bank. evaluate the air properties at an assumed mean temperature of -5°c and 1 atm. is this a good assumption?