Choose the best definitions of parameter and statistic. a. a statistic is a number that describes a population and a parameter is a number that describes a sample. b. a parameter is an unknown characteristic of a group and a statistic is a known characteristic of a group. c. a parameter is a number that describes a population. d. a statistic is a number that is used to estimate a parameter. e. a statistic is a variable that describes a sample and a parameter is a variable that describes a population. f. a statistic is a number that describes a sample and a parameter is a number that describes a population.

50*10 is greater

step-by-step explanation:

if you add the zero from 10 to 50, it will give you a bigger number.

the solution of the equation is 2.23 ⇒ answer b

step-by-step explanation:

* lets revise the meaning of exponential function

- the form of the exponential function is y = ab^x, where a ≠ 0, b > 0 ,  

  b ≠ 1, and x is any real number

- it has a constant base b

- it has a variable exponent x

- to solve an exponential equation, take the log or ln of both sides,  

  and solve for the variable

* lets solve the problem

∵

- the base is 7 and the exponent is x

- insert ㏑ in both sides

∴

- use the rule

∴ x ㏑(7) = ㏑(77)

- to find x divide both sides by ㏑(7)

∴

* the solution of the equation is 2.23 to the nearest 2 decimal places

inverse property is the answer

step-by-step explanation: