A manager at a pizza shop wants to start visually checking finished pizzas, but she doesn't have time to check every pizza. She decides to check a random pizza in the first 20 made each day, and then check every 20th pizza thereafter. What type of sample is this?

This type of sampling done by the manager at the pizza shop is called the Systematic sampling

Given that a manager at a pizza shop wants to start visually checking finished pizzas, but she doesn't have time to check every pizza.

As she decides to check a random pizza in the first 20 made each day, and then check every 20th pizza thereafter so it clear that she is checking the pizza after a regular interval.

Systematic sampling is the form of random sampling method in which the members of a large population set is selected randomly in the beginning of sampling but the sampling is done with fixed periodic interval.

The fixed periodic interval is  called the sampling interval.

The benefits of systematic sampling is that it is less prone to contamination of the data and the approach is based on clustered selection of sample.

For more information please refer to the link given below

link

Systematic sampling

Step-by-step explanation:

Systematic sampling is a form of random sampling that involves sampling based on numbering the members of the population and selecting the sample at a given specified interval.

However, when the systematic sampling technique is used, it is necessary to ensure that the numbering of the population does not result in an ordering of the population such that the selected sample will consist more of a particular group of the population.

if x = 1, then the answer is 3.5

solution:

the given function is ,

      =

the three roots of this quadratic function is , 0 ,8 and 10.all the roots are real and rational.

if a quadratic equation is of the form ,

sum of the roots = a + b +c= 0+8+10=18=  

product of roots taken two at a time = a b + b c+ c a = 0+80+0=80 =  

product of roots = a b c = 0=  

there are 11 doors in a hall starting from 0 to 11.the entry in the hall is permitted through gate number 0 and exit is allowed through only gate number 8 and 10.so, three roots(0,8,10) of quadratic function is given by entry and exit route of this hall.