Q3 - Index, slice, summarize Take a look at the .head() of cal. It is a dataframe of people running a 10 mile race (many years ago). Each person in that race has a bib number, a finishing position, first and last names, a city, zipcode of origin, their age, their completion time in seconds ('time. sec'), their starting corral, pace, and speed. Calculate the mean completion time in seconds (using the mean function you imported earlier), and assign that to the variable mean_time. get the age the person who finished first (first row) and assign that to best_age Calculate the mean speed (speed. mph) of the top 10 finishers (the first 10 rows), store that has top10speed

Write a car class having two private member variables called tank and speed. write public methods called pumpgas and gofast. the method pumpgas gets an integer for gas that must be pumped. that value needs to be added to tank (no more than 20 gallons). it must return the amount of gas that is purchased ($4 per gallon). the method gofast should increase the speed by 5 each time it is called.write a constructor for the above class that initialized both variables to zero.write a tostring to display both the tank and speed when the car is printed.modify the car class to implement the interface comparable and an interface called carinter having the public methods in carinter.write the main program to create an array of size 5 of type car. create 5 car objects having each location of the array to refer to one of the cars. test the pumpgas, gofast, equals method on the array items. write an enhanced loop to print all the car values (using a tostring written last time).write a generic method to find the minimum of four items. pass int, double, char, string and car objects to test this method.

Facial expressions and gestures are examples of messages.

Auser is given read permission to a file stored on an ntfs-formatted volume. the file is then copied to a folder on the same ntfs-formatted volume where the user has been given full control permission for that folder. when the user logs on to the computer holding the file and accesses its new location via a drive letter, what is the user's effective permission to the file? a. read b. full control c. no access d. modify e. none of the above