Question

Determine the t-value in each of the cases.

(a) Find the t-value such that the area in the right tail is 0.02 with 14 degrees of freedom.

Smith is a weld inspector at a shipyard. He knows from keeping track of good and substandard welds that for the afternoon shift 5% of all welds done will be substandard. If Smith checks 300 of the 7500 welds completed that shift, what is the probability that he will find between 10 and 20 substandard welds?

a. 0.8132

b. 0.6377

c. 0.2033

d. 0.4066

Answer #1

Ans :

Here n=300 , p=0.05

therefore the required probability is 0.8132

So answer is a. 0.8132

Smith is a weld inspector at a shipyard. He knows from keeping
track of good and substandard welds that for the afternoon shift 5%
of all welds done will be substandard. If Smith checks 300 of the
7500 welds completed that shift, what is the probability that he
will find between 10 and 20 substandard welds?

smith is a weird inspector at a shipyard. he knows for keeping
track of good and standard welds that for the afternoon shift 5% of
all welds done will be standard. If smith checks 300 of the 7500
welds completed that shift, what is the probability that he will
find between 10 and 20 substandard welds

Smith is a weld inspector at a shipyard. He knows from keeping
track of good and substandard welds that for the afternoon shift 5%
of all welds done will be substandard. If Smith checks 300 of the
7500 welds completed that shift, what is the probability that he
will find between 10 and 20substandard welds? A)0.2033 B)0.6377
C)0.8132 D)0.4066
P ( 10 ≤ X ≤ 20
)
Z1 = (X1 - µ ) / σ = -1.32
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