A group of students carry out an experiment to determine the count rate from a radioactive source. To begin with, they find the radioactive background count rate in the laboratory by making three readings. Each reading is collected over a 10-minute interval. Their results are shown in the table. Number of counts in 10 minutes: - first measurement: 170 - second measurement: 164 - third measurement: 185 After that, the students record the counts close to the radioactive source. This count rate is given as 949 counts per minute. What is the corrected count rate for the source?
- A932 counts per minute
- B776 counts per minute
- C430 counts per minute
- D78 counts per minute