Answer:
x = 32
Step-by-step explanation:
= 
= 
( cross- multiply )
x = 8 × 4 = 32
Sample size, n = 75
Point estimate, p = 52/75 = 0.693
Z at 99.7% confidence interval ≈ 2.96
Population mean interval = p+/- Z*Sqrt [p(1-p)/n]
Substituting;
Population mean interval = 0.693 +/- 2.96*Sqrt [0.693(1-0.693)/75] = 0.693+/-0.158 = (0.535,0.851) or (53.5%,85.1%)
72 days equals 24×72=1728 hours plus 16= 1744 plus 30 minutes is 1744.50
