6x6,
12x3,
30+6,
72÷2,
9x4,
40-4,
78-42,
12+24,
5+31,
(10x3)+6,
56-20,
21+15,
47-11,
2x18,
1x36,
96-(30x2),
(8x2)×(2x10),
(112÷2)-20,
(56÷4)+(11x2),
17+19,
(5x6)+6,
(7x5)+1,
92-56,
(3x3)+(3x9),
36+0,
(3x2)x6,
(11x3)+3
Hope this helps :)
Answer:
B
Step-by-step explanation:
A deck of card is made up of 4 suits: clubs, diamonds, hearts and spades. each suit has 13 cards ranging from: 2,3,4,5,6,7,8,9,1
Amiraneli [1.4K]
The probability of drawing a 7 or 8 from a decl of playing cards is 2/13.
Let, the integers = x,(x+1)
x*(x+1) = 56
x²+x = 56
x²+x-56 = 0
x²+8x-7x-56=0
x(x+8)-7(x+8)=0
x+8= 0 OR x-7=0
x = -8 OR x = 7
it would be -8 & -7 or 7 & 8
Standard deviation= σ= 0.1
Confidence interval= 95%= 0.95
Significance level=α= 1-0.95= 0.05
α/2 = 0.025
At α/2 z( α/2 ) =1.960 [from statistic table]
Now,
the sample size at error of 0.02 is
0.02=z( α/2 )σ/√n
0.02=(1.960)*(0.1)/√n
5/49 = 1/√n
√n=49/5
n=96.04
n should be 96 or greater
