Answer:
(155.301 ; 159.299)
Step-by-step explanation:
Xbar = 157.3
Sample size, n = 234
Population standard deviation, σ = 15.6
The confidence interval :
Xbar ± standard Error
Standard Error = Zcritical * σ/√n
Zcritical at 95% = 1.96
Standard Error = 1.96 * (15.6/√234) = 1.999
Lower boundary : 157.3 - 1.999 = 155.301
Upper boundary : 157.3 + 1.999 = 159.299
(155.301 ; 159.299)
Answer:
4 13/9 - 1 7/9
3 6/9
3 2/3
Step-by-step explanation:
5^4 (five to the 4th power)
Answer:
x+3*1/x=52/7
7x^2/7x+21/7x=52x/7x
7x^2-52x+21=0
I solve this with the quadratic formula
Solution of ax^2+bx+c=0, a≠0 are :
x1=
and x2= 
so a=7, b=-52,c=21
x1=
= (52+46)/14=98/14=7
x2=(52-46)/14=6/14=3/7
Step-by-step explanation: