Answer:
8 more boys
Step-by-step explanation:
5 + 3 = 8
32 ÷ 8 = 4
5 × 4 = 20
3 × 4 = 12
20 - 12 = 8
Answer:
The population mean is 5 volts
Step-by-step explanation:
Output voltage is assumed to be normally distributed, with standard deviation 0.25 Volts
s=0.25
n = 8

Sample mean = 
Since n < 30 and population standard deviation is unknown
So, we will use t test
Formula : 

t=-1.69
Refer the t table for p value
Degree of freedom = n-1 = 8-1 = 7
So,
P value >α
So, We are failed to reject null hypothesis
Hence The population mean is 5 volts
Answers
2880
Step-by-step explanation:
48 miles = 1 minute
? = 60 minutes( 1hr )
1hr = 48 × 60 = 2880miles