Explanation

A standard normal distribution has:

Mean = 0

Standard deviation = 1

So, Variance = (Standard deviation)² = 1² = 1

Explanation

The expression "p implies q" is written as p → q, which means if p is true, then q must also be true.

So, p → q is the correct symbolic form.

Explanation

A foreign key is used to link two tables and can contain duplicate values.

In contrast, primary, candidate, and even secondary keys are typically unique.

Explanation

math.h is the standard C/C++ header file that contains declarations for common mathematical functions like sqrt(), pow(), sin(), etc.

It must be included when using built-in math operations in programs.

Explanation

A circum-circle is a circle that passes through all the vertices of a triangle.

Its center is called the circumcenter.

Explanation

When a coin is tossed once, the possible outcomes are Head (H) or Tail (T).

The sample space is the set of all possible outcomes: {H, T}.

Explanation

An address is an identifiable location in computer memory where data is stored.

Each memory cell has a unique address used to access or modify data.

Explanation

A normal distribution is symmetrical and has a bell-shaped curve.

It represents data that clusters around a central mean.

Explanation

long double provides higher precision than double and float for storing real numbers.

It allows more digits after the decimal point, making it suitable for high-accuracy calculations.

Explanation

The array {1 2 8 3} has 1 row and 4 columns.

So, its order is 1 × 4.