Acertain flight arrives on time 79 percent of the time. suppose 144 flights are randomly selected. use the normal approximation to the binomial to approximate the probability that

a) exactely 100 flights are on time

b) at least 100 flights are on time

c)fewer than 125 flights are on time

d) between 125 and 126, inclusive are on time

show step by step. especially if you used a calclator or table to find p after calculating the z score.

At wind speeds above 1000 centimeters per second (cm/sec), significant sand-moving events begin to occur. wind speeds below 1000 cm/sec deposit sand and wind speeds above 1000 cm/sec move sand to new locations. the cyclic nature of wind and moving sand determines the shape and location of large dunes. at a test site, the prevailing direction of the wind did not change noticeably. however, the velocity did change. fifty-nine wind speed readings gave an average velocity of x = 1075 cm/sec. based on long-term experience, σ can be assumed to be 245 cm/sec. (a) find a 95% confidence interval for the population mean wind speed at this site. (round your answers to the nearest whole number.) lower limit cm/sec upper limit cm/sec