It is known that the variance of a population equals 1,936. A random sample of 121 has been selected from the population. There is a .95 probability that the sample mean will provide a margin of error of . Group of answer choices 31.36 or less 1,936 or less 344.96 or less 7.84 or less

Option d (7.84 or less) is the right alternative.

Step-by-step explanation:

Given:

Random sample,

The level of significance,

= 0.95

or,

hence,

The margin of error will be:

⇒

By putting the values, we get

  or  

step-by-step explanation:

if the four friends split the cost, p, of the pizza evenly, then each friend pays one-fourth of the cost of the pizza.

the expression is   or