Answer: D.) 3
Step-by-step explanation:
Given: Mean diameter: 
Standard deviation: 
The required number of standard deviations is given by :-

Hence, a beach ball with a diameter of 31.9 cm is 3 standard deviations differ from the mean.
Answer:
280/80 = 28/8 = 7/2 = 3.5 cm
Step-by-step explanation:
the ratio is 1cm/80mi = a cm/280mi
so you get 280cm * mi = 80mi*a cm
so a = 280/80 = 3.5
Answer:
Step-by-step explanation:
Answer:
-16
Step-by-step explanation:
-13 + (|-2+5|) -6 ➡ -13 + 3-6 = -16
You can set up proportions to find the width of the stream.
6/7.5=x/28
Cross multiply and solve for x.
168=7.5x
Divide by 7.5
x=22.4 ft
The stream is 22.4 ft wide