Explanation:

Mainframe computers are large, powerful computers that are used by organizations to perform complex and critical tasks. They have high-speed processors, large storage capacities, and are capable of handling a large number of simultaneous users.

On the other hand, mini computers are smaller and less powerful than mainframe computers. They are typically used in small to medium-sized businesses and have lower speed and storage capacities compared to mainframes.

Reasons why mini computers are lower to mainframe computers in terms of speed and storage capacity:

1. Size and processing power:
- Mainframe computers are much larger and more powerful than mini computers.
- They have multiple processors and are designed to handle large amounts of data and complex calculations simultaneously.
- Mini computers, on the other hand, have smaller processors and are not as capable of handling large workloads.

2. Storage capacity:
- Mainframe computers have large storage capacities, often measured in terabytes or even petabytes.
- They are designed to store vast amounts of data for organizations that require extensive data processing and storage capabilities.
- Mini computers have smaller storage capacities compared to mainframes, often measured in gigabytes or terabytes.

3. Number of simultaneous users:
- Mainframe computers are built to handle a large number of simultaneous users.
- They have built-in features to support multiple users accessing the system concurrently without any performance degradation.
- Mini computers, on the other hand, are typically used by a smaller number of users simultaneously.

4. Cost:
- Mainframe computers are expensive to purchase and maintain.
- They require specialized infrastructure and IT staff to manage and operate.
- Mini computers are relatively cheaper compared to mainframes, making them more affordable for small to medium-sized businesses.

Conclusion:
In summary, mini computers are lower to mainframe computers in terms of speed and storage capacity due to their smaller size, lower processing power, and limited storage capabilities. However, mini computers are still suitable for many businesses that do not require the extensive capabilities and resources provided by mainframe computers.