2x-3=7
2x=7+3
2x=10
x=10:2
x=5
Have a nice day!! ^^
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%)
1/6 = 0.166 = 16.6% or if u need it rounded = 17%
Answer: The probability of Dana selecting a hockey card will be a 4/36 or 1/9.
Work:
1.I added all of the cards together.
2.I saw that the number of hockey cards was 4 and divided it by 36 (the total number of cards)
3.Simplified
7/100
3/10
21/125
3/ 2500
7/50
I simplified them for you