There are 10 multiple-choice questions on a math quiz. Each question has four answer choices with one correct answer. Let X represent the number of questions answered correctly for a student who is randomly guessing each answer choice. Have the conditions for a binomial setting been met for this scenario?

No, the order of the questions is unknown.
Yes, all four conditions in BINS have been met.
No, the answers are not independent of one another.
No, we do not know how many quizzes this teacher will give.

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Step-by-step explanation:

 A. He changed the sign of the coefficient. A negative exponent does not affect the sign of a coefficient in scientific notation. The sign of the exponent determines the direction the decimal is moved in.

B. He rewrote incorrectly; . The exponent is increased to account for the extra place the decimal is moved.

Step-by-step explanation:

Given expression :

[Taking coefficients and exponents separate]

[By law of exponent]

Here he changed the sign of the coefficient. A negative exponent does not affect the sign of a coefficient in scientific notation. The sign of the exponent determines the direction the decimal is moved in.

Convert in scientific form.

In the given explanation he rewrote incorrectly; . The exponent is increased to account for the extra place the decimal is moved.

Thus, option A and B express the errors done by Stephen.