Answer:Sure thing? But first what do you need help with and maybe just maybe I will help you with whatever you need help with?
Step-by-step explanation:
Find amount used:
Amount in the card = $20
Amount left = $13.28
Amount used = $20 - $13.28 = $6.72
Find duration of the call:
24 cents = 1 min
672 cents = 1/24 x 672 = 28 mins
Answer: The call was 28 minutes long.
I hope this is the right answer to the question i hope i helped you.
Answer:
The amount of CD's she could buy would be 3.
Step-by-step explanation:
80-20=60
60÷18 = 3 CD's
The Empirical Rule states that, when the distribution is bell-shaped, around 95% of all observations will be within 2 standard deviations from the mean, which means from μ - 2σ to μ + 2σ.
The binomial distribution is a bell-shaped distribution with:
μ = np and
σ = √(np(1-p))
Therefore, 95% of the outcomes will be in the interval from np-2√(np(1-p)) and np+2√(np(1-p))
Any observation that lies outside this interval (which means greater than np+2√(np(1-p)) or less than np-2<span>√(np(1-p))</span> ) occurs less then 5% of the times and therefore can be considered "unusual".
