The probability that the use of electricity during the day will not exceed the norm = 0.75.

The probability that the use of electricity during the day will not exceed the norm = 0.75. What is the probability that in the next 6 days the use of electricity for 4 days will not exceed the norm?

The probability that the use of electricity per day will not exceed the norm: p = 0.75.
The probability that it will exceed: q = 1 – p = 1 – 0.75 = 0.25.
Using the Bernoulli formula, we find the probability that during 4 days the flow rate will not exceed the norm:
P6 (4) = C (6,4) p ^ 4 q ^ 2 = 6! / (4! (6 – 4)!) 0.75 ^ 4 0.25 ^ 2 = 15 0.316 0.0625 = 0.296.
Answer: 0.296.