From a data source whose values follow a normal distribution as expected value and standard deviation =1.6, 14 figures are observed, the average of which is 4.8. Determine the intermediate estimate of the parameter with a confidence level of 95%.

(a) Lower limit of the intermediate estimate:

(b) Upper limit of the interim estimate:

Enter the exact value or approximation of your answer to three decimal places. Use a period as the decimal separator.