Final answer:
The student's mathematics question was answered by establishing variables for the number of messages Keisha sent and creating equations to solve for all individuals. Keisha sent 17 messages, Jose sent 27, and Ravi sent 34. Additional text message statistics were calculated but probabilities were not given due to lack of distribution data.
Step-by-step explanation:
The subject of this question is mathematics, as it involves variables and solving equations to find the number of text messages sent by Kelsha, Jose, and Ravi.
Step-by-Step Explanation
Let the number of messages Keisha sent be x. Therefore, Ravi sent 2x messages, and Jose sent x + 10. The total messages sent by the three is 78.
We set up the equation: x + 2x + (x + 10) = 78. Simplifying the equation, we get 4x + 10 = 78. Subtracting 10 from both sides, 4x = 68. Dividing both sides by 4, we find out that x = 17. Using this, we calculate the number of messages for each person: Keisha (x) sent 17, Jose (x + 10) sent 27, Ravi (2x) sent 34.
Given the average of 41.5 text messages sent or received per day:
- A user sends or receives approximately 1.7292 text messages per hour (41.5 texts divided by 24 hours).
- The probability that a user sends or receives two messages per hour is not provided, as more information about the distribution is needed (such as if it's Poisson distributed, normal, etc.).
- The probability of sending or receiving more than two messages per hour would depend on the same distribution data.