Due to the capacity of laptops, a market analyst believes that the number of laptops per household has increased.In the past,themean number of laptops per household was 1.8 with a standard deviation of 0.1.To test his belief, the analyst takes a random sample of 98 households and finds a mean of 4.2 laptops.Let the significance level be 1%.Assume the conditions are satisfied.What is the value of the calculated test statistic?Please give your answer correctly rounded to two decimal places.