Professional Courses
Industry-relevant training in Business, Technology, and Design to help professionals and graduates upskill for real-world careers.
Categories
Interactive Games
Fun, engaging games to boost memory, math fluency, typing speed, and English skills—perfect for learners of all ages.
Typing
Memory
Math
English Adventures
Knowledge
Enroll to start learning
You’ve not yet enrolled in this course. Please enroll for free to listen to audio lessons, classroom podcasts and take mock test.
Practice Questions
Test your understanding with targeted questions related to the topic.
Question 1
Easy
What is the midpoint of the class interval 20-30?
💡 Hint: Add the lower and upper limits and divide by 2.
Question 2
Easy
If a class has a frequency of 4 and a midpoint of 15, what is fx?
💡 Hint: Multiply frequency by midpoint.
Practice 4 more questions and get performance evaluation
Interactive Quizzes
Engage in quick quizzes to reinforce what you've learned and check your comprehension.
Question 1
What is the formula for calculating the mean of grouped data?
- a) Mean = Σf / n
- b) Mean = Σ(f * x) / Σf
- c) Mean = Σ(x - x̄)²
💡 Hint: Think about the values we are summing and dividing by.
Question 2
True or False: The standard deviation can be negative.
- True
- False
💡 Hint: What does standard deviation represent?
Solve 1 more question and get performance evaluation
Challenge Problems
Push your limits with challenges.
Question 1
A fruit vendor records the weights of bags: 1-3 kg (5), 3-5 kg (10), 5-7 kg (15). Determine the mean and standard deviation of the weights.
💡 Hint: Follow through with midpoints and properly calculate deviations.
Question 2
In a survey, ages are grouped as follows: 0-20 (4), 21-40 (6), 41-60 (10). Find the variance of the ages.
💡 Hint: Don't forget to use midpoints and find squared differences.
Challenge and get performance evaluation