A sample of 100 dry battery cells tested to find the length of life produced the following results : X= 12 hours, a= 3 hours Assuming the data to be normally distributed, what percentage of battery cells are expected to have life : () More than 15 hours, ( Less than 6 hours, and

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A sample of 100 dry battery cells tested to find the length of life produced
the tollowing results :
X= 12 hours, o =3 hours
Assuming the data to be normally distributed, what percentage of battery cells are expected to
have lile :
() More than 15 hours,
(h) Less than 6 hours, and
(i) between 10 and 14 hours ?
(Given z:
2.5
1.
0.67
sta
sD0.3413
sd aou w etubiti b
Area
0.4938
0.4772
0.2487
Transcribed Image Text:A sample of 100 dry battery cells tested to find the length of life produced the tollowing results : X= 12 hours, o =3 hours Assuming the data to be normally distributed, what percentage of battery cells are expected to have lile : () More than 15 hours, (h) Less than 6 hours, and (i) between 10 and 14 hours ? (Given z: 2.5 1. 0.67 sta sD0.3413 sd aou w etubiti b Area 0.4938 0.4772 0.2487
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