Home › AP Statistics › Statistics › Continuous Random Variables › In the notation X ~ U(a, b), the letter a stands…
In the notation X ~ U(a, b), the letter a stands for:
AThe mean of the sample
BThe count of the trials
CThe lowest value of x
DThe highest value of x
Answer & Solution
Correct answer: C. The lowest value of x
1. The two parameters mark the ends of the range.
2. The notation for the uniform distribution is X ~ U(a, b).
3. In that notation a is the lowest value of x.
4. The letter b is the highest value of x.
_Source: OpenStax Introductory Statistics 2e (CC BY 4.0), Ch 5 'Continuous Random Variables', sections 5.1-5.3_
Related questions
Finding the 90th percentile of a smiling-time distribution means finding the value below wThe pdf and the cdf differ in that the cdf gives:If X ~ U(0, 10), the probability that x lies between 2 and 4 comes from the area that is:Because P(x = c) is zero for a continuous variable, P(c < x < d) and P(c <= x <= d) are:The exponential distribution's memorylessness means past waiting time affects future waitiIn the customer-arrival example, time between customers is exponential with a mean of:Calculations with the exponential distribution require knowledge of which quantity?The probability P(c < x < d) is the area under the curve, above the x-axis, and: