USA Today reported that about 20% of all people In the United States are Illiterate. Suppose you take eleven people at random off a city street LUSE SALT (a) Make a histogram showing the probability distribution of the number of illiterate people out of the eleven people in the sample. 0.30 0.30 0.25 0.25 0.20 0.20 0.15 A 0.15 0.10 0.10 0.05 0.05 0 12 3 4 5 6 7 8 9 10 11 0 1 2 3 4 5 6 7 8 9 10 11 0.30 0.30 0.25 0.25 0.20 0.20 E 0.15 0.15 0.10 0.10 0.05 0.05 0 1 2 3 4 5 6 7 8 9 10 11 0 1 2 3 4 5 6 7 8 9 10 11 (b) Find the mean and standard deviation of this probability distribution. (Round your standard deviation to two decimal places.) people рeople Find the expected number of people in this sample who are illiterate. people
Continuous Probability Distributions
Probability distributions are of two types, which are continuous probability distributions and discrete probability distributions. A continuous probability distribution contains an infinite number of values. For example, if time is infinite: you could count from 0 to a trillion seconds, billion seconds, so on indefinitely. A discrete probability distribution consists of only a countable set of possible values.
Normal Distribution
Suppose we had to design a bathroom weighing scale, how would we decide what should be the range of the weighing machine? Would we take the highest recorded human weight in history and use that as the upper limit for our weighing scale? This may not be a great idea as the sensitivity of the scale would get reduced if the range is too large. At the same time, if we keep the upper limit too low, it may not be usable for a large percentage of the population!
![**Educational Exercise: Understanding Probability Distributions**
USA Today reported that about 20% of all people in the United States are illiterate. Suppose you take eleven people at random off a city street.
**Task (a): Construct a Histogram**
Create a histogram showing the probability distribution of the number of illiterate people out of the eleven people in the sample. Analyze the four given histograms:
1. **First Histogram:**
- x-axis (r) ranges from 0 to 11, representing the number of illiterate people.
- y-axis (P(r)) shows the probability of each outcome.
- The distribution peaks between 3 and 4 illiterate people, indicating the most probable outcomes.
2. **Second Histogram:**
- Similar x-axis and y-axis.
- Peaks at 2 illiterate people, slightly skewed toward fewer illiterate individuals than the first histogram.
3. **Third Histogram:**
- Follows the same range on each axis.
- Highest probability between 2 and 3 illiterate people, demonstrating a similar distribution to the second histogram but slightly more concentrated.
4. **Fourth Histogram:**
- Consistent axes.
- Peak at 4 illiterate people, skewed toward a greater number of illiterate individuals compared to other histograms.
**Task (b): Calculate Statistical Measures**
Determine the mean (μ) and standard deviation (σ) of this probability distribution. Round your standard deviation to two decimal places.
\[ \mu = \text{people} \]
\[ \sigma = \text{people} \]
**Additional Analysis:**
Calculate the expected number of people in the sample who are illiterate.
\[ \text{Expected number: } \text{ people} \]
This exercise aids in understanding how probability distributions represent real-world statistics, allowing for prediction and analysis of societal data.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F2003d332-f35a-4e8d-8a41-5d3fb7e691ff%2Fe7372c12-2fb6-4539-a806-458227be4885%2Fil3uy5s_processed.jpeg&w=3840&q=75)
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