A company employs 160 sales executives. A random sample of 60 was selected, 35 of them showed the volume of orders taken this month was higher than for the same month last year. Find a 95% confidence interval for the population proportion of sales representatives with a higher volume of orders.

Select one:

a.0.4586 to 0.7081

b.0.1141 to 0.3234

c.0.1547 to 0.2828

d.0.5044 to 0.6622

In a fund raising event, it is found that the amount of donation collected is normally distributed with mean of RMand standard deviation of RM 80. If 35% who attended the event donated more than RM 380, find the value of.

Select one:

a.RM 318.80

b.RM 348.80

c.RM 330.00

d.RM 360.00

Averagely, 4 residents of Twin Condominium enter the building randomly and independently every 10 minutes. Find the probability that none enter the building in 5 minutes.

Select one:

a.0.9817

b.0.0183

c.0.1353

d.0.8647

It was known that 17% of nonelderly Americans adults had no health insurance in 2005. Suppose that a random sample of 450 such individuals was drawn. What is the probability that 16% or more had no health insurance?

Select one:

a.0.7157

b.0.7190

c.0.2843

d.0.2810

The amount of time spent by students watching movie per day is normally distributed with a mean of 5 hours and a standard deviation of 1.3 hours. Calculate the probability that in a random sample of five students, exactly four watch television for more than 6 hours per day.

Select one:

a.0.9902

b.0.9573

c.0.2206

d.0.0092

A poll found that 19% of Australian do not work at all while on summer vacation. In a random sample of 16 Australian, find the probability that more than two of Australian do not work during summer vacation.

Select one:

a.0.8368

b.0.1632

c.0.2267

d.0.6101