Suppose an internet marketing company wants to determine the current percentage of customers who click on ads on their smartphones. How many customers should the company survey in order to be 90% confident that the estimated proportion is within five percentage points of the true population proportion of customers who click on ads on their smartphones

The value is    

Step-by-step explanation:

From the question we are told that

  The margin of error is  

From the question we are told the confidence level is  95% , hence the level of significance is    

=>  

Generally from the normal distribution table the critical value  of   is  

Generally we will assume that the sample proportion is since we have no information on the proportion of  of customers who click on ads on their smartphones

Generally the sample size is mathematically represented as

=>    

=>        

the final price would be 29.6925

step-by-step explanation:

39.59 minus 25% equals 29.6925

it would take 7/10 of an hour too fill the pool.

step-by-step explanation: