How many chirps will a snowy tree cricket give is 21 seconds at a temperature of 22 degree celcius

There is an established correlation between the number of chirps of a cricket and temperature. The function is

ln C = - 6713.2 / T + 25.868

Where c is the number of chirps per min and T is the temperature in K

We are given

T = 22 C + 273 = 295K

Solving for C

ln C = - 6713.2 / 295 + 25.868

C = 22.45 chirps/min

In 21 seconds, the number of chips is

22.45 chirps / min (1 min/60 s) (21 s) = 7.86 chirps