Answer:
1200 signatures are needed
Step-by-step explanation:
t = total number of signatures
t * 36% = 432
Change to decimal form
.36t = 432
Divide each side by .36
.36t/.36 = 432/.36
t =1200
1200 signatures are needed
Answer:
[22.57 ± 2.776]
Step-by-step explanation:
Hello!
You have the 95% Confidence Z-interval (21.182;23.958), the mean X[bar]= 22.57 and the sample size n=25.
The formula for the Z interval is
[X[bar] ±
]
The value of Z comes from tha standard normal table:
![Z_{1-\alpha /2} = Z_{0.975}= 1.96](https://tex.z-dn.net/?f=Z_%7B1-%5Calpha%20%2F2%7D%20%3D%20Z_%7B0.975%7D%3D%201.96)
The semiamplitude (d) or margin of error (E) of the interval is:
E or d= (Upperbond- Lowerbond)/2 = (23.958-21.182)/2 = 2.776
[X[bar] ± E]
[22.57 ± 2.776]
I hope it helps!
Im not sure if this is what you’re looking for but hope it helped!
20 102.3 rounded down is 100 4.7 rounded up is 5. 100 / 5 = 20 because 5 * 20 = 100
answer= 15
the sum of 14 =1+4= 5
and twice of this is= 5x2= 10
so total saving is= 5+10= 15