Answer: The car age's standard deviation is 2.17 years. Step-by-step explanation: The Empirical Rule indicates that for a normally distributed random variable: 68% of values fall within one standard deviation of the mean, 95% within two, and 99.7% within three. In this context, given a mean of 7.5 years, with 99.7% of car ages ranging from 1 to 14 years implies that 1 year is three standard deviations below the mean while 14 years is three above. Thus, the calculation for standard deviation yields 2.17 years.
It amounts to 96. I hope this was helpful.
Answer:
For Question 1, there were 4500 gallons of water in the tank.
For Question 2, it will take 70 minutes to fill the pool with water.
Step-by-step explanation:
Explanation for Question 1: Simply multiply 150 by the time in minutes.
This can be expressed using the general formula for a² – b².
I estimate that a total of 50 students participated in the survey
and 18 expressed a desire to learn Spanish.