A low-noise transistor for use in computing products is being developed. It is claimed that the mean noise level will be below the 2.5-dB level of products currently in use. It is believed that the noise level is approximately normal with a standard deviation of .8. find 95% CI

The 95% CI is  

Step-by-step explanation:

From the question we are told that

   The  population mean

    The standard deviation is  

Given that the confidence level is  95% then the level of confidence is mathematically evaluated as

   =>  

  =>    

Next we obtain the critical value of   from the normal distribution table, the values is  

Generally the margin of error is mathematically evaluated as

here we would assume that the sample size is  n =  16 since the person that posted the question did not include the sample size

  So    

The  95% CI is mathematically represented as

substituting values

substituting values

c. 27 units.

step-by-step explanation:

we are told that in circle a, ∠bae ≅ ∠dae.

we can see from our given diagram that in and ;

, as these are radii of our given circle.

therefore, by sas congruence postulate.

hence, side be will be equal to side de as corresponding parts of congruent triangles are congruent. so we can set an equation to find the value of x as:

now let us substitute x=17 in the expression for the length of be.

therefore, length of be will be 27 units and option c is the correct choice.

don't report but were is the digram

step-by-step explanation: