The World Health Organization (WHO) has an online dashboard showing where the cases of covid-19 are and how many there are in the world as of march 13 of this year. The image on the left state how many cases there are (142,538), how many deaths there are to date (5,391), and how many countries or territories there are with confirmed cases (135).
The graph below is called a histogram. It shows how many confirmed cases there are per day from January 13 to March 13 of this year. it shows that there was a spike in cases on February 12 with approximately 15,200 new cases that day. The second spike in cases came on March 12 with approximately 11,600 new cases worldwide.
Dividing the 5,931 deaths by the 142,538 cases gives a worldwide mortality rate of 3.8% so far.
China has the most cases with 81,121 because this is where the pandemic began. The graph shows that after the spike on Feb 12, the rate of growth there has leveled off. The mortality rate there is 3.9%. They have taken the most stringent measures to control the spread of the disease by quarantining whole cities.